Clamp and method for assembling low-pressure turbine guider

Abstract

The invention relates to an aero-engine manufacturing technology, in particular to a clamp and method for assembling a low-pressure turbine guider. The clamp comprises a bottom plate and a force application cylinder; a plurality of stand column assemblies are annularly and evenly distributed on the bottom plate. The top ends of the multiple stand column assemblies are jointly provided with a guide cylinder, and the force application cylinder is slidably installed in a center hole of the guide cylinder. A plurality of positioning blocks are annularly and uniformly distributed on the top surface of the bottom plate; arc-shaped positioning spigots are formed in the positioning blocks, and the arc-shaped positioning spigots of all the positioning blocks are located on the same circumference; a driving gear and a driven gear which are meshed with each other are mounted on the top surface of the force application cylinder; a pull rod is fixedly installed in the center of the bottom plate, and a threaded rod is arranged on the upper portion of the pull rod and matched with a threaded hole in the center of the driven gear. When the guider is used, the force application cylinder can vertically press downwards, so that the deformation of the sealing pad on each part of the circumference is consistent, the sealing pad is ensured to be uniformly pressed, and the problem that the local assembly of the guider is not in place in the prior art is solved.

Description

Technical Field

[0001] The invention relates to aeroengine manufacturing technology, and in particular to a fixture and a method for assembling a low-pressure turbine guide vane. Background Art

[0002] Combination Figure 1 It is a schematic structural diagram of the guide 100 after being assembled into the outer casing 200 , and a sealing gasket 300 is arranged between the guide 100 and the outer casing 200 .

[0003] Figure 2 For traditional assembly fixtures, Figure 3 The figure is a schematic diagram of assembling the low-pressure turbine guide vane by using a conventional fixture. In the conventional fixture, a pressing plate is used to axially press the sealing gasket 300 to achieve assembly.

[0004] Traditional assembly fixtures have the following problems:

[0005] (1) In the conventional clamp, the pressure plate is sleeved on the center rod, and the nut screwed on the upper part of the center rod is turned by a wrench, and the nut descends to press the pressure plate. Since the nut only exerts downward pressure on the pressure plate, it is easy to cause the pressure plate to tilt, resulting in inconsistent deformation at various locations on the circumference of the sealing gasket 300, causing the sealing gasket 300 to deform, resulting in the guide being partially assembled out of place.

[0006] (2) During the assembly process, due to the need for a large clamping force, the traditional clamp requires a very long force wrench, which is not convenient to operate. Summary of the invention

[0007] The main purpose of the present invention is to provide a fixture and method for assembling a low-pressure turbine guide vane, aiming to solve the above-mentioned technical problems.

[0008] To achieve the above-mentioned purpose, on the one hand, the present invention proposes a fixture for assembling a low-pressure turbine guide vane, comprising a base plate and a force cylinder; a plurality of column assemblies are evenly distributed in an annular manner on the base plate; a guide cylinder is commonly installed at the top ends of the plurality of column assemblies, and the force cylinder is slidably installed in the center hole of the guide cylinder; a plurality of positioning blocks are evenly distributed in an annular manner on the top surface of the base plate; arc-shaped positioning stops are provided on the positioning blocks, and the arc-shaped positioning stops of all the positioning blocks are located on the same circumference; a driving gear and a driven gear that mesh with each other are installed on the top surface of the force cylinder; a pull rod is fixedly installed at the center of the base plate, and the upper part of the pull rod is provided as a threaded rod, and the threaded rod cooperates with the threaded hole in the center of the driven gear.

[0009] Preferably, a first mounting hole and a second mounting hole are provided on the top plate of the force cylinder, and the second mounting hole is located at the center of the top plate of the force cylinder; an insertion rod is integrally formed on the bottom surface of the driving gear, and a wrench rotating rod is integrally formed on the top surface; the insertion rod is rotatably inserted in the first mounting hole; an insertion portion is provided at the center of the bottom surface of the driven gear, and the insertion portion is rotatably inserted in the second mounting hole.

[0010] Preferably, a first annular oil storage groove is provided on the top surface of the force cylinder, the first annular oil storage groove is concentrically arranged with the first mounting hole, and butter is stored in the first annular oil storage groove for lubricating the bottom surface of the driving gear; a plurality of second annular oil storage grooves are provided on the top surface of the force cylinder, the second annular oil storage grooves are concentrically arranged with the second mounting hole, and butter is stored in the second annular oil storage grooves for lubricating the bottom surface of the driven gear.

[0011] Preferably, the outer cylindrical surface of the force-applying cylinder is stepped, and includes a sliding fit section and a pressing section; the sliding fit section is slidingly fitted with the center hole of the guide cylinder; the pressing section is used to extend into the outer casing and press the sealing gasket.

[0012] Preferably, a plurality of gear limiters are installed on the top surface of the force cylinder; the gear limiter is a component with a Z-shaped cross-section formed by an upper plate body, a lower plate body and an arc-shaped connecting plate; the lower plate body is screwed to the top plate of the force cylinder, the upper plate body is placed on the top surface of the driven gear, and the bottom surface of the upper plate body is slidably matched with the top surface of the driven gear.

[0013] Preferably, a gear cover is screwedly connected to the top surface of the force applying cylinder, and the gear cover covers the driving gear, and a wrench rotating rod of the driving gear extends out from a center hole of the gear cover.

[0014] Preferably, the guide cylinder comprises an integrally formed circular ring plate and a cylinder body; the force-applying cylinder is slidably matched with a center hole of the cylinder body; and the circular ring plate is connected to the column assembly.

[0015] Preferably, the column assembly includes an upper flange body, a steel pipe and a lower flange body; the top and bottom of the upper flange body and the lower flange body are respectively integrally formed with bosses; the boss on the top of the upper flange body is inserted into the annular plate of the guide cylinder, and the flange edge of the upper flange body is screwed to the annular plate; the boss on the bottom of the upper flange body is inserted into the top center hole of the steel pipe and welded; the boss on the top of the lower flange body is inserted into the bottom center hole of the steel pipe and welded; the boss on the bottom of the lower flange body is inserted into the bottom plate, and the flange edge of the lower flange body is screwed to the bottom plate.

[0016] Preferably, a lifting eye screw is installed on the top of the column assembly.

[0017] On the other hand, the present invention also provides a method for assembling a low-pressure turbine guide vane, using the above-mentioned fixture, comprising the following steps:

[0018] S1. Remove the assembly consisting of the force cylinder, the driving gear and the driven gear from the fixture;

[0019] S2. Place the outer casing in the fixture so that the lower end of the outer casing is mounted on the arc-shaped positioning stop of the positioning block, and then sequentially place the guide and the sealing gasket into the outer casing;

[0020] S3, install the assembly consisting of the force cylinder, the driving gear and the driven gear in the center hole of the guide cylinder, rotate the driving gear in the forward direction to drive the driven gear to rotate, so that the threaded rod on the upper part of the pull rod is screwed into the threaded hole in the center of the driven gear;

[0021] S4, continue to rotate the driving gear forward and drive the driven gear to rotate, the driven gear moves downward along the axial direction of the pull rod, driving the force cylinder to slide downward in the center hole of the guide cylinder, so that the pressing section of the force cylinder extends into the outer casing and presses the sealing gasket;

[0022] S5. After the guide is assembled, rotate the driving gear in the opposite direction to make the driven gear move upward along the axial direction of the pull rod, driving the force cylinder to slide downward in the center hole of the guide cylinder. When the threaded rod on the upper part of the pull rod is disengaged from the threaded hole of the driven gear, the assembly consisting of the force cylinder, the driving gear and the driven gear can be removed from the fixture, and the assembled outer casing, guide and sealing gasket can be taken out.

[0023] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0024] (1) In the present invention, the assembly consisting of the force cylinder, the driving gear and the driven gear is installed in the center hole of the guide cylinder. When the outer casing, the guide and the sealing gasket are assembled and pressed, the driving gear is rotated to drive the driven gear to rotate, and the driven gear moves downward along the axis of the pull rod, driving the force cylinder to slide downward in the center hole of the guide cylinder, so that the pressing section of the force cylinder extends into the outer casing and presses the sealing gasket. Since the force cylinder slides downward in the center hole of the guide cylinder, it guides the force cylinder, so that the force cylinder is pressed vertically, so that the deformation of the sealing gasket is consistent at various places on the circumference, ensuring that the sealing gasket is evenly pressed, and overcoming the problem of partial inadequate assembly of the guide in the prior art.

[0025] (2) In the present invention, by utilizing the driving gear to drive the driven gear to rotate, the torque can be amplified, which saves effort and overcomes the inconvenience caused by the need for a long force wrench in the traditional clamp. The entire clamp has a simple structure, is easy to operate, and is easy to manufacture.

[0026] (3) In the present invention, a first annular oil storage groove and a second annular oil storage groove are provided on the top surface of the force cylinder, and butter is stored in the oil storage groove to lubricate the bottom surfaces of the driving gear and the driven gear, thereby reducing the friction between the driving gear, the driven gear and the top surface of the force cylinder, thereby further achieving a labor-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the structure after the guide is assembled into the outer casing;

[0029] Figure 2 It is a schematic diagram of a traditional assembly fixture;

[0030] Figure 3 A schematic diagram of assembling a low-pressure turbine guide vane using a conventional fixture;

[0031] Figure 4 A schematic diagram of a fixture for assembling a low-pressure turbine guide vane provided by the present invention;

[0032] Figure 5 A three-dimensional structural diagram of a fixture for assembling a low-pressure turbine guide vane provided by the present invention;

[0033] Figure 6 It is a structural schematic diagram of the bottom plate of the present invention;

[0034] Figure 7 for Figure 6 Middle AA section view;

[0035] Figure 8 It is a front view of the pull rod in the present invention;

[0036] Fig. 9 A top view of the pull rod of the present invention;

[0037] Fig.10 It is a structural schematic diagram of the positioning block in the present invention;

[0038] Fig.11 It is a structural schematic diagram of the force-applying cylinder in the present invention;

[0039] Fig.12 for Fig.11 Middle BB section view;

[0040] Fig.13 It is a structural schematic diagram of the guide cylinder in the present invention;

[0041] Fig.14 It is a structural schematic diagram of the driven gear in the present invention;

[0042] Fig.15 is a cross-sectional view of the driven gear in the present invention;

[0043] Fig.16 It is a structural schematic diagram of the driving gear in the present invention;

[0044] Fig.17 It is a structural schematic diagram of the middle column assembly of the present invention;

[0045] Fig.18 It is a structural schematic diagram of the gear limiting member in the present invention;

[0046] Fig.19 The figure is a schematic diagram of assembling a low-pressure turbine guide vane using the fixture provided by the present invention.

[0047] Explanation of the accompanying drawings: 1. Base plate; 2. Positioning block; 3. Guide cylinder; 3a. Circular ring plate; 3b. Cylinder; 4. Force cylinder; 4a. Sliding fit section; 4b. Pressing section; 4c. First mounting hole; 4d. Second mounting hole; 4e. First annular oil storage tank; 4f. Second annular oil storage tank; 5. Pull rod; 6. Driven gear; 6a. Plug-in portion; 7. Driving gear; 7a. Insert rod; 7b. Wrench turning rod; 8. Gear cover; 9. Gear limiter; 9a. Upper plate body; 9b. Lower plate body; 9c. Arc connecting plate; 10. Column assembly; 10a. Upper flange body; 10b. Steel pipe; 10c. Lower flange body; 11. Eye screw; 100. Guide; 200. Outer casing; 300. Sealing pad. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] Combination Figures 4 to 18 As shown, the present embodiment also provides a fixture for assembling a low-pressure turbine guide vane, comprising a base plate 1 and a force cylinder 4; a plurality of column assemblies 10 are evenly distributed in an annular pattern on the base plate 1; a guide cylinder 3 is commonly installed at the top ends of the plurality of column assemblies 10, and the force cylinder 4 is slidably installed in the center hole of the guide cylinder 3; a plurality of positioning blocks 2 are evenly distributed in an annular pattern on the top surface of the base plate 1; an arc-shaped positioning stop 2a is provided on the positioning block 2, and the arc-shaped positioning stop 2a of all the positioning blocks 2 are located on the same circumference; a driving gear 7 and a driven gear 6 that mesh with each other are installed on the top surface of the force cylinder 4; a pull rod 5 is fixedly installed at the center of the base plate 1, and the upper part of the pull rod 5 is provided as a threaded rod 5a, and the threaded rod 5a cooperates with the threaded hole in the center of the driven gear 6.

[0052] In this embodiment, a first mounting hole 4c and a second mounting hole 4d are provided on the top plate of the force cylinder 4, and the second mounting hole 4d is located at the center of the top plate of the force cylinder 4; an insertion rod 7a is integrally formed on the bottom surface of the driving gear 7, and a wrench rotating rod 7b is integrally formed on the top surface, and the wrench rotating rod 7b is used to cooperate with the wrench; the insertion rod 7a is rotatably inserted in the first mounting hole 4c; an insertion portion 6a is provided at the center of the bottom surface of the driven gear 6, and the insertion portion 6a is rotatably inserted in the second mounting hole 4d.

[0053] In this embodiment, the diameter of the driving gear 7 is smaller than the diameter of the driven gear 6, and the number of teeth of the driving gear 7 is less than that of the driven gear 6. Therefore, by utilizing the driving gear 7 and driving the driven gear 6 to rotate, the torque can be amplified, which saves effort and overcomes the operational inconvenience caused by the traditional clamp requiring a very long force wrench.

[0054] In this embodiment, a first annular oil storage groove 4e is provided on the top surface of the force cylinder 4, the first annular oil storage groove 4e is concentrically arranged with the first mounting hole 4c, and butter is stored in the first annular oil storage groove 4e for lubricating the bottom surface of the driving gear 7; a plurality of second annular oil storage grooves 4f are provided on the top surface of the force cylinder 4, the second annular oil storage grooves 4f are concentrically arranged with the second mounting hole 4d, and butter is stored in the second annular oil storage grooves 4f for lubricating the bottom surface of the driven gear 6.

[0055] By adopting the above structure, the friction between the driving gear 7, the driven gear 6 and the top surface of the force cylinder 4 is reduced, which further plays a role in saving effort.

[0056] In this embodiment, the outer cylindrical surface of the force cylinder 4 is stepped, including a sliding fit section 4a and a clamping section 4b; the sliding fit section 4a slides with the center hole of the guide cylinder 3; the clamping section 4b is used to extend into the outer casing 200 and clamp the sealing gasket 300.

[0057] Combination Figure 5 , Fig.18 As shown, a plurality of gear stoppers 9 are installed on the top surface of the force cylinder 4; the gear stoppers 9 are components with a Z-shaped cross section formed by an upper plate 9a, a lower plate 9b and an arc-shaped connecting plate 9c; the lower plate 9b is screwed to the top plate of the force cylinder 4, the upper plate 9a is placed on the top surface of the driven gear 6, and the bottom surface of the upper plate 9a is slidably matched with the top surface of the driven gear 6. At the same time, the gear stoppers 9 are provided to limit the axis of the driven gear 6.

[0058] Combination Figure 5 As shown, a gear cover 8 is screwed to the top surface of the force cylinder 4, and the gear cover 8 covers the driving gear 7, and the wrench rotating rod 7b of the driving gear 7 extends from the center hole of the gear cover 8. The purpose of setting the gear cover 8 is to limit the axis of the driving gear 7.

[0059] Combination Fig.13 As shown, the guide cylinder 3 includes an integrally formed circular ring plate 3 a and a cylinder body 3 b ; the force-applying cylinder 4 is slidably matched with the center hole of the cylinder body 3 b ; and the circular ring plate 3 a is connected to the column assembly 10 .

[0060] Combination Fig.17As shown, the column assembly 10 includes an upper flange body 10a, a steel pipe 10b and a lower flange body 10c; the upper flange body 10a and the lower flange body 10c are respectively integrally formed with bosses at the top and bottom; the boss at the top of the upper flange body 10a is inserted on the annular plate 3a of the guide cylinder 3, and the flange edge of the upper flange body 10a is screwed to the annular plate 3a; the boss at the bottom of the upper flange body 10a is inserted into the top center hole of the steel pipe 10b and welded. The boss at the top of the lower flange body 10c is inserted into the bottom center hole of the steel pipe 10b and welded; the boss at the bottom of the lower flange body 10c is inserted on the bottom plate 1, and the flange edge of the lower flange body 10c is screwed to the bottom plate 1.

[0061] Combination Figure 4 , Figure 5 As shown, in order to facilitate the lifting of the entire clamp, a lifting eye screw 11 is installed on the top of the column assembly 10. Specifically, the lifting eye screw 11 is screwed on the upper flange body 10a.

[0062] Combination Fig.19 As shown, this embodiment also provides a method for assembling a low-pressure turbine guide vane, using the above-mentioned fixture, comprising the following steps:

[0063] S1, remove the assembly consisting of the force cylinder 4, the driving gear 7 and the driven gear 6 from the fixture;

[0064] S2, placing the outer casing 200 in a fixture so that the lower end of the outer casing 200 is mounted on the arc-shaped positioning stop 2a of the positioning block 2, and then sequentially placing the guide 100 and the sealing gasket 300 into the outer casing 200;

[0065] S3, install the assembly consisting of the force cylinder 4, the driving gear 7 and the driven gear 6 in the center hole of the guide cylinder 3, rotate the driving gear 7 in the forward direction, drive the driven gear 6 to rotate, so that the threaded rod 5a on the upper part of the pull rod 5 is screwed into the threaded hole in the center of the driven gear 6;

[0066] S4, the driving gear 7 continues to rotate forward and drives the driven gear 6 to rotate, and the driven gear 6 moves downward along the axial direction of the pull rod 5, driving the force cylinder 4 to slide downward in the central hole of the guide cylinder 3, so that the pressing section 4b of the force cylinder 4 extends into the outer casing 200 and presses the sealing gasket 300;

[0067] S5. After the guide 100 is assembled, the driving gear 7 is rotated in the opposite direction to make the driven gear 6 move upward along the axial direction of the pull rod 5, driving the force cylinder 4 to slide downward in the center hole of the guide cylinder 3. When the threaded rod 5a on the upper part of the pull rod 5 is disengaged from the threaded hole of the driven gear 6, the assembly consisting of the force cylinder 4, the driving gear 7 and the driven gear 6 can be removed from the fixture, and the assembled outer casing 200, the guide 100 and the sealing pad 300 can be taken out.

[0068] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fixture for assembling a low-pressure turbine guide vane, characterized in that: It comprises a base plate (1) and a force-applying cylinder (4); a plurality of column assemblies (10) are evenly distributed in an annular manner on the base plate (1); A guide cylinder (3) is commonly installed at the top ends of the plurality of column assemblies (10), and the force-applying cylinder (4) is slidably installed in the center hole of the guide cylinder (3); A plurality of positioning blocks (2) are evenly distributed in an annular shape on the top surface of the bottom plate (1); arc-shaped positioning stoppers (2a) are provided on the positioning blocks (2), and the arc-shaped positioning stoppers (2a) of all the positioning blocks (2) are located on the same circumference; A driving gear (7) and a driven gear (6) that mesh with each other are installed on the top surface of the force-applying cylinder (4); A pull rod (5) is fixedly installed at the center of the base plate (1), and the upper part of the pull rod (5) is arranged as a threaded rod (5a), and the threaded rod (5a) matches with the threaded hole at the center of the driven gear (6).

2. A fixture for assembling a low-pressure turbine guide vane according to claim 1, characterized in that: A first mounting hole (4c) and a second mounting hole (4d) are provided on the top plate of the force-applying cylinder (4), and the second mounting hole (4d) is located at the center of the top plate of the force-applying cylinder (4); An insertion rod (7a) is integrally formed on the bottom surface of the driving gear (7), and a wrench rotating rod (7b) is integrally formed on the top surface; the insertion rod (7a) is rotatably inserted into the first mounting hole (4c); An inserting portion (6a) is provided at the center of the bottom surface of the driven gear (6), and the inserting portion (6a) is rotatably inserted into the second mounting hole (4d).

3. A fixture for assembling a low-pressure turbine guide vane according to claim 2, characterized in that: A first annular oil storage groove (4e) is provided on the top surface of the force application cylinder (4), the first annular oil storage groove (4e) is arranged concentrically with the first mounting hole (4c), and butter is stored in the first annular oil storage groove (4e) for lubricating the bottom surface of the driving gear (7); A plurality of second annular oil storage grooves (4f) are arranged on the top surface of the force application cylinder (4), the second annular oil storage grooves (4f) are arranged concentrically with the second mounting hole (4d), and butter is stored in the second annular oil storage grooves (4f) for lubricating the bottom surface of the driven gear (6).

4. A fixture for assembling a low-pressure turbine guide vane according to claim 1, characterized in that: The outer cylindrical surface of the force-applying cylinder (4) is stepped, and comprises a sliding fitting section (4a) and a pressing section (4b); the sliding fitting section (4a) is slidingly fitted with the central hole of the guide cylinder (3); the pressing section (4b) is used to extend into the outer casing (200) and press the sealing gasket (300).

5. A fixture for assembling a low-pressure turbine guide vane according to claim 1, characterized in that: A plurality of gear stoppers (9) are installed on the top surface of the force cylinder (4); the gear stoppers (9) are components with a Z-shaped cross section, which are composed of an upper plate (9a), a lower plate (9b) and an arc-shaped connecting plate (9c); the lower plate (9b) is screwed to the top plate of the force cylinder (4); the upper plate (9a) rests on the top surface of the driven gear (6); and the bottom surface of the upper plate (9a) is slidably matched with the top surface of the driven gear (6).

6. A fixture for assembling a low-pressure turbine guide vane according to claim 2, characterized in that: A gear cover (8) is screwed to the top surface of the force cylinder (4), and the gear cover (8) covers the driving gear (7), and a wrench rotating rod (7b) of the driving gear (7) extends out from the center hole of the gear cover (8).

7. A fixture for assembling a low-pressure turbine guide vane according to claim 1, characterized in that: The guide cylinder (3) comprises an integrally formed circular ring plate (3a) and a cylinder body (3b); the force-applying cylinder (4) is slidably matched with a central hole of the cylinder body (3b); and the circular ring plate (3a) is connected to the column assembly (10).

8. A fixture for assembling a low-pressure turbine guide vane according to claim 7, characterized in that: The column assembly (10) comprises an upper flange body (10a), a steel pipe (10b) and a lower flange body (10c); the top and bottom of the upper flange body (10a) and the lower flange body (10c) are respectively integrally formed with convex columns; The convex column at the top of the upper flange body (10a) is inserted into the circular ring plate (3a) of the guide cylinder (3), and the flange edge of the upper flange body (10a) is screwed to the circular ring plate (3a); the convex column at the bottom of the upper flange body (10a) is inserted into the top center hole of the steel pipe (10b) and welded; The boss on the top of the lower flange body (10c) is inserted into the center hole at the bottom end of the steel pipe (10b) and welded; the boss on the bottom of the lower flange body (10c) is inserted on the bottom plate (1), and the flange edge of the lower flange body (10c) is screwed to the bottom plate (1).

9. A fixture for assembling a low-pressure turbine guide vane according to claim 1, characterized in that: A lifting eye screw (11) is installed on the top end of the column assembly (10).

10. A method for assembling a low-pressure turbine guide vane, characterized in that: Using the clamp according to any one of claims 1 to 9, comprising the following steps: S1, removing the assembly consisting of the force cylinder (4), the driving gear (7) and the driven gear (6) from the fixture; S2, placing the outer casing (200) in a fixture so that the lower end of the outer casing (200) is mounted on the arc-shaped positioning stop (2a) of the positioning block (2), and then sequentially placing the guide (100) and the sealing gasket (300) into the outer casing (200); S3, install the assembly consisting of the force cylinder (4), the driving gear (7) and the driven gear (6) in the center hole of the guide cylinder (3), rotate the driving gear (7) in the forward direction, drive the driven gear (6) to rotate, so that the threaded rod (5a) on the upper part of the pull rod (5) is screwed into the threaded hole in the center of the driven gear (6); S4. Continue to rotate the driving gear (7) in the forward direction and drive the driven gear (6) to rotate. The driven gear (6) moves downward along the axial direction of the pull rod (5), driving the force cylinder (4) to slide downward in the center hole of the guide cylinder (3), so that the pressing section (4b) of the force cylinder (4) extends into the outer casing (200) and presses the sealing gasket (300); S5. After the guide (100) is assembled, the driving gear (7) is rotated in the opposite direction, so that the driven gear (6) moves upward along the axial direction of the pull rod (5), driving the force cylinder (4) to slide downward in the center hole of the guide cylinder (3). When the threaded rod (5a) on the upper part of the pull rod (5) is disengaged from the threaded hole of the driven gear (6), the assembly consisting of the force cylinder (4), the driving gear (7) and the driven gear (6) can be removed from the fixture, and the assembled outer casing (200), the guide (100) and the sealing gasket (300) can be taken out.

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