A turbine guide vane active positioning fixture

Abstract

The present application relates to the technical field of aero-engine blade machining fixture, and more particularly to a turbine guide vane movable positioning fixture. The turbine guide vane movable positioning fixture comprises a base body, a movable positioning assembly, a supporting assembly and a pressing assembly which are mounted on the base body. The movable positioning assembly comprises a movable positioning member and a driving mechanism, the driving mechanism drives the movable positioning member to switch between a positioning position and a retreat position. The supporting assembly comprises a supporting member and a locking structure, the supporting member is used for supporting the bottom of the blade. The pressing assembly is used for pressing the blade on the supporting member. When positioning, the movable positioning member moves to the positioning position and contacts the blade for positioning; the supporting member abuts against the bottom of the blade and is locked by the locking structure; then the movable positioning member moves to the retreat position and is separated from the blade; finally, the pressing assembly presses the blade on the supporting member. The present application separates the positioning function from the force bearing function, so that the pressing force is borne by the supporting member and is avoided from acting on the precision casting surface, the risk of bruising is eliminated, the clamping operation is simplified, and the manufacturing cost of the fixture is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of machining fixtures for aero-engine blades, and more specifically, to a movable positioning fixture for turbine guide vanes. Background Technology

[0002] Turbine guide vanes are crucial components of aero-engines. Their blade bodies and flow channels are typically precision-cast with no machining allowance, while the upper and lower edge plates and inner and outer arcs require machining to ensure assembly accuracy. In the initial machining process, a six-point positioning method is used to clamp the part, machining the arcs and end faces of the inlet or exhaust edge. The remaining parts are then machined using the surface formed in this process as a reference. Since the positioning points are usually located on the precision-cast blade body and flow channel surfaces with no machining allowance, achieving reliable positioning and clamping without damaging the precision-cast surfaces is the core technical challenge of this process.

[0003] Existing technology discloses a six-point positioning fixture for turbine guide vanes, which employs six fixed positioning points and four screw-driven movable supports at the bottom. During clamping, the hinge must first be opened to insert the part, and then multiple screws must be manually tightened to press the part against the positioning points, relying on the threaded joints to maintain the clamping force. In this design, the positioning points are always in contact with the precision-cast surface, making it difficult to precisely control the threaded clamping force. This easily damages the precision-cast surface during machining, leading to part scrap. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies where parts are easily damaged due to the fixed positioning point being directly pressed against the precision casting surface. This invention provides a turbine guide vane movable positioning fixture that allows the positioning point in the main force direction to be removed after positioning, with the clamping force borne by an independent support component. This fundamentally avoids the clamping force acting on the precision casting surface, thereby eliminating the risk of parts being damaged.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A turbine guide vane movable positioning fixture is provided, comprising a base and a movable positioning assembly, a support assembly, and a clamping assembly respectively mounted on the base; the movable positioning assembly includes a movable positioning member slidably connected to the base and a drive mechanism mounted on the base; the drive mechanism is convexly connected to the movable positioning member to drive the movable positioning member to move between a positioning position and a retraction positioning position; the support assembly includes a support member movably mounted on the base and a locking structure mounted on the base for locking the position of the support member, the support member being used to support the bottom of the blade; the clamping assembly is used to clamp the blade onto the support member; when the movable positioning member is in the positioning position, it contacts the blade to position the blade, and after the support member abuts against the bottom of the blade, the locking structure locks the support member; after the movable positioning member moves to the retraction positioning position and disengages from the blade, the clamping assembly clamps the blade onto the support member.

[0006] The working principle of the turbine guide vane movable positioning fixture of the present invention is as follows: The movable positioning component moves to the positioning position under the action of the drive mechanism. At this time, the movable positioning component contacts the blade and positions the blade. After positioning, the support component extends and abuts against the end face of the blade bottom. This end face is the surface to be machined with machining allowance and does not involve the precision-cast surface. Subsequently, the locking structure locks the support component in the current position, enabling it to withstand the forces during subsequent clamping and machining processes. Then, the drive mechanism drives the movable positioning component to move in the opposite direction to the retraction positioning position, completely disengaging the movable positioning component from the blade. Finally, the clamping assembly clamps the blade onto the support component. At this time, all the clamping force is borne by the support component and transmitted to the base, while the movable positioning component has disengaged from the blade. The precision-cast surface is not subjected to force during the entire clamping and machining process, thus avoiding the risk of crushing. This solution separates the positioning function and the load-bearing function, achieving effective protection for the precision-cast surface without machining allowance, while simplifying the clamping operation process.

[0007] Furthermore, the driving mechanism includes an eccentric shaft rotatably connected to the base. The eccentric shaft has an eccentric section, the outer periphery of which abuts against the movable positioning member. The eccentric shaft drives the movable positioning member to move by rotation. Using an eccentric shaft as the driving mechanism results in a simple and compact structure. The movable positioning member can be switched back and forth between the positioning position and the retraction position simply by rotating the eccentric shaft, making operation convenient. The eccentric mechanism itself has a self-locking characteristic, enabling it to maintain stability in the positioning position.

[0008] Furthermore, the movable positioning component is provided with a drive groove, and the eccentric segment of the eccentric shaft passes through the drive groove, with the outer periphery of the eccentric segment abutting against the groove wall of the drive groove. Through the cooperation of the drive groove and the eccentric segment, the rotational motion of the eccentric shaft is converted into the reciprocating sliding of the movable positioning component along a set direction, resulting in smooth and reliable transmission. The drive groove constrains and guides the eccentric segment, ensuring that the movable positioning component slides along a predetermined trajectory.

[0009] Furthermore, the eccentricity of the eccentric segment is 0.5mm to 2mm.

[0010] Furthermore, it also includes a limiting member installed on the base; the limiting member is located on the sliding path of the movable positioning member and is used to limit the movable positioning member to the positioning position; when the movable positioning member slides to abut against the limiting member, the eccentric shaft is in a self-locking state. The limiting member can accurately limit the stopping position of the movable positioning member in the positioning position, ensuring the consistency of the positioning position each time and improving the positioning accuracy; at the same time, when the movable positioning member abuts against the limiting member, the eccentric shaft is in a self-locking state, so even if the operating torque is removed, the movable positioning member cannot be pushed to reverse the eccentric shaft when subjected to external force, thereby ensuring that the movable positioning member can be stably maintained in the positioning position during the positioning process and will not be displaced due to slight contact during blade installation.

[0011] Furthermore, the support assembly also includes an elastic element, one end of which is connected to the base and the other end to the support member. The elastic element applies an elastic force to the support member, causing the support member to abut against the bottom of the blade. The elastic element allows the support member to automatically pop out and abut against the bottom surface of the blade after it is installed, eliminating the need for manual adjustment of the support member's height and reducing operational difficulty. Simultaneously, the flexible contact method of the elastic element also prevents impact damage to the blade.

[0012] Furthermore, the support assembly also includes an adjusting member disposed at the bottom of the base, the adjusting member abutting against one end of the elastic member, for adjusting the preload of the elastic member. The adjusting member allows for convenient adjustment of the initial preload of the elastic member, making the support assembly more adaptable to blades of different specifications or batches, and allowing for adjustment of the support force according to actual processing needs.

[0013] Furthermore, the locking structure includes a locking member threadedly connected to the base body, and a stop surface is provided on the side of the support member. The end of the locking member abuts against the stop surface to lock the support member onto the base body. This locking method, using a threaded locking member in conjunction with a stop surface, is simple, reliable, and easy to operate; locking and releasing the support member can be achieved simply by rotating the locking member.

[0014] Furthermore, an anti-rotation shaft is provided on the side of the support member, and a limit groove is formed at the corresponding position of the base; the anti-rotation shaft extends into the limit groove to restrict the support member from rotating around its own axis. The cooperation between the anti-rotation shaft and the limit groove can effectively prevent the support member from rotating during the lifting process, avoiding instability or positioning deviation caused by the rotation of the support member.

[0015] Furthermore, the system also includes a fixed positioning assembly mounted on the substrate. This fixed positioning assembly comprises multiple fixed positioning elements, which, together with the movable positioning elements, constitute multiple positioning points for positioning the blade. The fixed positioning elements remain fixed relative to the substrate, while the movable positioning elements can switch between a positioning position and a retraction position. When the movable positioning element is in the positioning position, the fixed and movable positioning elements together form a complete positioning constraint on the blade, limiting all degrees of freedom of the blade in space.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The turbine guide vane movable positioning fixture of the present invention achieves the separation of positioning function and load-bearing function by actively retracting the movable positioning component after positioning and having the clamping force borne by an independent support component. This fundamentally avoids the clamping force acting on the precision casting surface without machining allowance, eliminating the risk of damage to the parts. At the same time, it simplifies the clamping operation process and reduces the manufacturing difficulty and cost of the fixture.

[0017] 1. This invention provides a movable positioning component, which, after positioning, can move from the positioning position to the retraction position and disengage from the blade. This prevents the movable positioning component from contacting the precision-cast surface of the blade during clamping and processing, thus avoiding damage or deformation of the parts caused by the clamping force acting on the precision-cast surface through the positioning point.

[0018] 2. This invention uses an eccentric shaft to drive the movement of the movable positioning component, which, together with the limiting component, achieves precise positioning and self-locking. The movable positioning component can be switched between the positioning position and the retraction position simply by rotating the eccentric shaft handle, making the operation convenient and quick. Moreover, the self-locking characteristic of the eccentric shaft ensures the positional stability of the movable positioning component during the positioning process.

[0019] 3. By setting an elastic element in the support assembly, the present invention enables the support to automatically pop out and abut against the bottom end face of the blade after the blade is installed, eliminating the need for workers to manually adjust the height of the support, greatly reducing the difficulty of clamping operations, and ensuring reliable contact between the support and the bottom end face of the blade. Attached Figure Description

[0020] Figure 1 A schematic diagram of the movable positioning fixture for turbine guide vanes; Figure 2A schematic diagram of the turbine guide vane movable positioning fixture from another perspective; Figure 3 This is a structural schematic diagram of the movable positioning component; Figure 4 This is a schematic diagram of the eccentric shaft structure; Figure 5 This is a schematic diagram of the structure from the perspective of the eccentric shaft along the axial direction. Figure 6 This is a structural schematic diagram of the support component; Figure 7 This is a schematic diagram of the working state of the turbine guide vane movable positioning fixture.

[0021] In the attached diagram: 10, base; 20, fixed positioning component; 21, spherical positioning component; 22, cylindrical positioning component; 30, movable positioning component; 31, arc-shaped positioning part; 32, drive groove; 40, eccentric shaft; 41, handle; 42, eccentric section; 50, limiting component; 60, support component; 61, stop surface; 62, anti-rotation shaft; 63, limiting edge; 70, locking component; 80, elastic component; 90, adjusting component; 100, clamping component. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," and "fitting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In the description of this specification, references to terms such as "embodiment" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] Example 1 This embodiment is the first embodiment of a turbine guide vane movable positioning fixture, such as... Figure 1 As shown, it includes a base 10 and a movable positioning component, a fixed positioning component, a support component, and a clamping component respectively mounted on the base 10.

[0027] like Figure 1 and Figure 2 As shown, the fixed positioning assembly includes three fixed positioning components 20, namely two spherical positioning components 21 disposed on the base 10 and located on the inner side of the blade, and a cylindrical positioning component 22 disposed on the base 10 and located on the back of the blade. The spherical positioning components 21 are used to contact the inner side of the blade to restrict the movement of the blade, and the cylindrical positioning component 22 is used to restrict the circumferential movement of the blade.

[0028] like Figure 1 and Figure 3 As shown, the movable positioning assembly includes a movable positioning member 30 slidably connected to the base 10 and a drive mechanism installed on the base 10. The sliding direction of the movable positioning member 30 is along the vertical direction. Three arc-shaped positioning parts 31 are provided at the top of the movable positioning member 30. A drive groove 32 extending along the sliding direction of the movable positioning member 30 is provided on the movable positioning member 30.

[0029] The drive mechanism is connected to the movable positioning member 30 to drive the movable positioning member 30 to move between the positioning position and the retraction positioning position. For example... Figure 4 and Figure 5As shown, in this embodiment, the driving mechanism is an eccentric shaft 40 rotatably connected to the base 10. One end of the eccentric shaft 40 is connected to a handle 41. The axes of the two ends of the eccentric shaft 40 are collinear and rotatably connected to the base 10 respectively. An eccentric section 42 is provided in the middle of the eccentric shaft 40. The eccentricity of the eccentric section 42 is between 0.5mm and 2mm, preferably 1mm in this embodiment. The eccentric section 42 of the eccentric shaft 40 passes through the driving groove 32. The outer periphery of the eccentric section 42 abuts against the groove wall of the driving groove 32. The width dimension of the driving groove 32 is 0.1mm larger than the diameter of the eccentric section 42. This facilitates the smooth installation of the eccentric shaft 40 while enabling the eccentric shaft 40 to drive the movable positioning member 30 to slide up and down. The length dimension of the driving groove 32 is larger than the entire rotation range of the eccentric shaft 40 when it rotates, ensuring that the eccentric shaft 40 rotates smoothly in the driving groove 32.

[0030] like Figure 1 As shown, two limiting members 50 are also installed on the base 10. The limiting members 50 are located above the sliding path of the movable positioning member 30 and are used to abut against the movable positioning member 30 to limit the movable positioning member 30 to the positioning position.

[0031] like Figure 1 and Figure 2 As shown, the support assembly includes three support members 60 movably mounted on the base 10 and a locking structure mounted on the base 10 for locking the position of each support member 60. The support members 60 are used to support the bottom of the blade. Specifically, as... Figure 6 As shown, the support member 60 is cylindrical and is slidably connected to the base 10 in the vertical direction. The locking structure includes three locking members 70, each corresponding to one support member 60. The locking members 70 are fastening bolts and are threadedly connected to the side of the base 10. The side of the support member 60 is provided with a stop surface 61. The end of the locking member 70 abuts against the stop surface 61 to fix the position of the support member 60.

[0032] like Figure 1 As shown, the clamping assembly includes three clamping members 100, which are respectively disposed above each support member 60. The clamping members 100 can be adjusted in the vertical direction by bolts, so that the blade can be clamped onto the support member 60.

[0033] The clamping operation procedure in this embodiment is as follows: First, rotating the handle 41 causes the eccentric shaft 40 to rotate, and the eccentric section 42 pushes the movable positioning member 30 to slide vertically until the movable positioning member 30 abuts against the limiting member 50. At this time, the movable positioning member 30 is exactly in the positioning position, the eccentric shaft 40 is in a self-locking state, and the movable positioning member 30 is stably held in this position. Then, the operator loads the blade into the fixture, so that the movable positioning member 30 contacts the positioning point of the blade to position the blade. At the same time, the operator adjusts the support member 60 so that the top of the support member 60 abuts against the bottom end face of the blade. Next, rotating the locking member 70 locks the support member 60 in the current position. Then, rotating the handle 41 in the opposite direction moves the movable positioning member 30 to the retraction positioning position and disengages from the blade. Finally, the clamping member 100 presses the blade onto the support member 60, completing the entire clamping process.

[0034] In this embodiment, the three fixed positioning members 20 and the three arc-shaped positioning parts 31 at the top of the movable positioning member 30 constitute six positioning points, which together form a complete constraint on the six degrees of freedom of the blade, achieving reliable and stable clamping. When the clamping member 100 clamps the blade, all the clamping force is borne by the support member 60 and transmitted to the base 10 through the locking structure, while the movable positioning member 30 has disengaged from the blade. Therefore, the precision-cast surface with no machining allowance is not subjected to force during the entire clamping and machining process, effectively avoiding damage to the part. The limiting member 50 ensures that the movable positioning member 30 can accurately stop at the same position each time, ensuring the consistency of positioning accuracy; the self-locking characteristic of the eccentric shaft 40 ensures that the movable positioning member 30 will not move unexpectedly due to external force during the positioning process.

[0035] In the above scheme, the number and position of the fixed positioning component 20 and the arc-shaped positioning part 31 can be set according to the actual positioning requirements.

[0036] In the above scheme, the sliding fit between the movable positioning component 30 and the base 10 can adopt a guide structure such as a dovetail groove or a rectangular groove to ensure that the movable positioning component 30 slides smoothly along the set direction without wobbling. The base 10 or the eccentric shaft 40 can be set with scale marks so that the operator can intuitively judge the rotation angle of the eccentric shaft 40 and the position of the movable positioning component 30.

[0037] Another way of cooperating between the eccentric shaft 40 and the movable positioning member 30 is provided here. In this way, the drive groove 32 is not provided. The outer periphery of the eccentric section 42 of the eccentric shaft 40 abuts against the bottom of the movable positioning member 30. By rotating the eccentric shaft 40, the movable positioning member 30 is raised and locked in the positioning position. After the blade is installed, the eccentric shaft 40 is rotated in the opposite direction, and the movable positioning member 30 slides down to the retraction positioning position under its own gravity.

[0038] In addition, the locking structure can also use snap-fit, pin fit, hydraulic support and other methods to achieve the position locking of the locking component.

[0039] Example 2 This embodiment is the second embodiment of the turbine guide vane movable positioning fixture. This embodiment is similar to the first embodiment, except that, as shown in the following... Figure 7 As shown, the support assembly also includes an elastic element 80 and an adjusting element 90. In this embodiment, the elastic element 80 is a compression spring. One end of the elastic element 80 abuts against the adjusting element 90, and the other end abuts against the bottom of the support element 60. The elastic element 80 is used to apply an elastic force in the vertical direction to the support element 60 so that the support element 60 always abuts against the bottom end face of the blade. The adjusting element 90 is an adjusting bolt that is threaded to the base 10. The adjusting element 90 is located at the bottom of the base 10. By rotating the adjusting element 90, the amount of compression on the elastic element 80 is changed, thereby adjusting the preload of the elastic element 80.

[0040] The elastic element 80 allows the support element 60 to automatically pop out and abut against the bottom end face of the blade after it is inserted, eliminating the need for manual adjustment of the height of the support element 60 and reducing operational difficulty. Simultaneously, the flexible contact method of the elastic element 80 avoids impact damage to the blade. The adjusting element 90 allows the preload of the elastic element 80 to be adjusted according to actual needs: when machining blades with good rigidity, the preload can be appropriately increased to ensure reliable contact between the support element 60 and the bottom of the blade; when machining blades with poor rigidity or high precision requirements, the preload can be appropriately decreased to avoid excessive support force leading to blade deformation. Furthermore, when the elastic element 80 experiences fatigue loosening after a period of use, the adjusting element 90 can compensate for the decrease in its preload, extending the service life of the fixture.

[0041] The remaining working principles of this embodiment are the same as those of the embodiments described above.

[0042] Example 3 This embodiment is the third embodiment of the turbine guide vane movable positioning fixture. This embodiment is similar to embodiment two, except that, as Figure 7 As shown, the support member 60 has an anti-rotation shaft 62 on its side, and a limiting groove is formed at the corresponding position on the base 10. The limiting groove extends vertically, and the anti-rotation shaft 62 extends into the limiting groove to restrict the support member 60 from rotating around its own axis. The cooperation between the anti-rotation shaft 62 and the limiting groove can effectively prevent the support member 60 from rotating during the lifting process, avoiding instability or positioning deviation caused by the rotation of the support member 60.

[0043] like Figure 6 As shown, the outer wall at the bottom of the support member 60 is provided with an annular limiting edge 63. The limiting edge 63 is used to abut against the base 10 to limit the movement and prevent the support member 60 from rising beyond its range.

[0044] The remaining working principles of this embodiment are the same as those of the embodiments described above.

[0045] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A movable positioning fixture for turbine guide vanes, characterized in that, It includes a base (10) and a movable positioning assembly, a support assembly and a clamping assembly respectively mounted on the base (10); The movable positioning component includes a movable positioning member (30) slidably connected to the base (10) and a driving mechanism mounted on the base (10); the driving mechanism is connected to the movable positioning member (30) in a transmission manner to drive the movable positioning member (30) to move between a positioning position and a retraction positioning position; The support assembly includes a support member (60) movably mounted on the base (10) and a locking structure mounted on the base (10) for locking the position of the support member (60), the support member (60) being used to support the bottom of the blade; the clamping assembly is used to clamp the blade onto the support member (60); When the movable positioning member (30) is in the positioning position, it contacts the blade to position the blade. After the support member (60) abuts against the bottom of the blade, the locking structure locks the support member (60). After the movable positioning member (30) moves to the retraction positioning position and disengages from the blade, the pressing assembly presses the blade onto the support member (60).

2. The turbine guide vane movable positioning fixture according to claim 1, characterized in that, The driving mechanism includes an eccentric shaft (40) rotatably connected to the base (10). The eccentric shaft (40) is provided with an eccentric section (42). The outer periphery of the eccentric section (42) abuts against the movable positioning member (30). The eccentric shaft (40) drives the movable positioning member (30) to move by rotation.

3. The turbine guide vane movable positioning fixture according to claim 2, characterized in that, The movable positioning component (30) has a drive groove (32), and the eccentric section (42) of the eccentric shaft (40) passes through the drive groove (32), with the outer periphery of the eccentric section (42) abutting against the groove wall of the drive groove (32).

4. The turbine guide vane movable positioning fixture according to claim 2, characterized in that, The eccentricity of the eccentric segment (42) is 0.5 mm to 2 mm.

5. The turbine guide vane movable positioning fixture according to claim 2, characterized in that, It also includes a limiting member (50) installed on the base (10); the limiting member (50) is located on the sliding path of the movable positioning member (30) and is used to limit the movable positioning member (30) to the positioning position; when the movable positioning member (30) slides to abut against the limiting member (50), the eccentric shaft (40) is in a self-locking state.

6. The turbine guide vane movable positioning fixture according to claim 1, characterized in that, The support assembly also includes an elastic element (80), one end of which is connected to the base (10) and the other end is connected to the support element (60); the elastic element (80) is used to apply an elastic force to the support element (60) so that the support element (60) abuts against the bottom of the blade.

7. The turbine guide vane movable positioning fixture according to claim 6, characterized in that, The support assembly also includes an adjustment member (90) disposed at the bottom of the base (10), the adjustment member (90) abutting against one end of the elastic member (80) for adjusting the preload of the elastic member (80).

8. The turbine guide vane movable positioning fixture according to claim 1, characterized in that, The locking structure includes a locking member (70) threadedly connected to the base (10), and a stop surface (61) is provided on the side of the support member (60). The end of the locking member (70) abuts against the stop surface (61) to lock the support member (60) onto the base (10).

9. The turbine guide vane movable positioning fixture according to claim 1, characterized in that, The support member (60) is provided with an anti-rotation shaft (62) on its side, and a limit groove is provided at the corresponding position of the base (10); the anti-rotation shaft (62) extends into the limit groove to restrict the support member (60) from rotating around its own axis.

10. The turbine guide vane movable positioning fixture according to any one of claims 1-9, characterized in that, It also includes a fixed positioning assembly installed on the base (10), the fixed positioning assembly including a plurality of fixed positioning elements (20), the fixed positioning elements (20) and the movable positioning elements (30) together forming a plurality of positioning points for positioning the blade.

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