A fixture and method for assembling a low-pressure turbine guide.

Abstract

This invention relates to aero-engine manufacturing technology, and more particularly to a fixture and method for assembling a low-pressure turbine guide. The fixture includes a base plate and a force-applying cylinder; multiple column assemblies are evenly distributed in a ring on the base plate; a guide cylinder is mounted on the top of each column assembly, and the force-applying cylinder is slidably installed in the central hole of the guide cylinder; multiple positioning blocks are evenly distributed in a ring on the top surface of the base plate; each positioning block has an arc-shaped positioning stop, and the arc-shaped positioning stops of all positioning blocks are located on the same circumference; a meshing drive gear and a driven gear are mounted on the top surface of the force-applying cylinder; a tie rod is fixedly mounted at the center of the base plate, the upper part of the tie rod being a threaded rod, and the threaded rod engaging with the threaded hole at the center of the driven gear. In use, the force-applying cylinder can be pressed down vertically, ensuring uniform deformation of the sealing gasket throughout the circumference, guaranteeing uniform compression of the sealing gasket, and overcoming the problem of partial misassembly of the guide in the prior art.

Description

Technical Field

[0001] This invention relates to aero-engine manufacturing technology, and more particularly to a fixture and method for assembling low-pressure turbine guide vanes. Background Technology

[0002] Combination Figure 1 The diagram shows the structure of the guide 100 after it is assembled into the outer casing 200. A sealing gasket 300 is provided between the guide 100 and the outer casing 200.

[0003] Figure 2 For traditional assembly fixtures, Figure 3 This is a schematic diagram of assembling a low-pressure turbine guide using a conventional fixture. In the conventional fixture, a pressure plate is used to axially compress the sealing gasket 300, thereby achieving assembly.

[0004] Traditional assembly fixtures have the following problems:

[0005] (1) In traditional fixtures, the pressure plate is fitted onto the central tie rod. By using a wrench to rotate the nut screwed onto the upper part of the central tie rod, the nut descends and exerts downward pressure on the pressure plate. Since the nut only exerts downward pressure on the pressure plate, it is easy for the pressure plate to tilt, resulting in inconsistent deformation at different points on the circumference of the sealing gasket 300. This causes the sealing gasket 300 to deform, resulting in partial misassembly of the guide.

[0006] (2) During the assembly process, due to the need for a large clamping force, traditional clamps require a long wrench, which is inconvenient to operate. Summary of the Invention

[0007] The main objective of this invention is to provide a fixture and method for assembling low-pressure turbine guide vanes, aiming to solve the aforementioned technical problems.

[0008] To achieve the above objectives, the present invention provides a fixture for assembling a low-pressure turbine guide, comprising a base plate and a force-applying cylinder; multiple column assemblies are evenly distributed in a ring on the base plate; a guide cylinder is mounted on the top of the multiple column assemblies, and the force-applying cylinder is slidably installed in the central hole of the guide cylinder; multiple positioning blocks are evenly distributed in a ring on the top surface of the base plate; the positioning blocks are provided with arc-shaped positioning stops, and the arc-shaped positioning stops of all 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-applying cylinder; a pull rod is fixedly installed at the center of the base plate, the upper part of the pull rod is configured as a threaded rod, and the threaded rod cooperates with the threaded hole at 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-applying cylinder, the second mounting hole being located at the center of the top plate of the force-applying cylinder; an insert 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 insert rod is rotatably inserted into the first mounting hole; a plug-in part is provided at the center of the bottom surface of the driven gear, and the plug-in part is rotatably inserted into the second mounting hole.

[0010] Preferably, a first annular oil reservoir is provided on the top surface of the force-applying cylinder. The first annular oil reservoir is concentrically arranged with the first mounting hole, and grease is stored in the first annular oil reservoir for lubricating the bottom surface of the driving gear. A plurality of second annular oil reservoirs are provided on the top surface of the force-applying cylinder. The second annular oil reservoirs are concentrically arranged with the second mounting hole, and grease is stored in the second annular oil reservoirs for lubricating the bottom surface of the driven gear.

[0011] Preferably, the outer cylindrical surface of the force-applying cylinder is stepped, including a sliding engagement section and a pressing section; the sliding engagement section is slidably engaged with the central 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 limiting components are installed on the top surface of the force-applying cylinder; the gear limiting component is a Z-shaped component consisting of an upper plate, a lower plate, and an arc-shaped connecting plate; the lower plate is screwed to the top plate of the force-applying cylinder, the upper plate rests on the top surface of the driven gear, and the bottom surface of the upper plate slides in contact with the top surface of the driven gear.

[0013] Preferably, a gear cover is screwed to the top surface of the force-applying cylinder, and the gear cover covers the drive gear, with the wrench lever of the drive gear extending from the center hole of the gear cover.

[0014] Preferably, the guide cylinder includes an integrally formed annular plate and a cylinder body; the force-applying cylinder is slidably fitted with the central hole of the cylinder body; and the annular 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 each integrally formed with a protruding post; the protruding post at 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 connected to the annular plate with screws; the protruding post at the bottom of the upper flange body is inserted into the central hole at the top of the steel pipe and welded thereon; the protruding post at the top of the lower flange body is inserted into the central hole at the bottom of the steel pipe and welded thereon; the protruding post at the bottom of the lower flange body is inserted into the base plate, and the flange edge of the lower flange body is connected to the base plate with screws.

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

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

[0018] S1. Remove the assembly consisting of the force-applying 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 place the guide and sealing gasket into the outer casing in sequence.

[0020] S3. Install the assembly consisting of the force-applying 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 at the top of the pull rod is screwed into the threaded hole in the center of the driven gear.

[0021] S4. Continue to rotate the drive gear in the forward direction and drive the driven gear to rotate. The driven gear moves downward along the pull rod axis, causing the force-applying cylinder to slide downward in the center hole of the guide cylinder, so that the pressing section of the force-applying cylinder extends into the outer casing and presses the sealing gasket.

[0022] S5. After the guide assembly is completed, rotate the drive gear in the opposite direction so that the driven gear moves upward along the tie rod axis, causing the force-applying cylinder to slide downward in the center hole of the guide cylinder. When the threaded rod on the upper part of the tie rod disengages from the threaded hole of the driven gear, the assembly consisting of the force-applying cylinder, drive gear and driven gear can be removed from the fixture, and the assembly consisting of the 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 this invention, by installing the assembly consisting of a force-applying cylinder, a drive gear, and a driven gear in the central hole of the guide cylinder, during the assembly and pressing of the outer casing, guide, and sealing gasket, the drive gear is rotated and drives the driven gear to rotate. The driven gear moves downward along the pull rod axis, causing the force-applying cylinder to slide downward in the central hole of the guide cylinder, so that the pressing section of the force-applying cylinder extends into the outer casing and presses the sealing gasket. Since the force-applying cylinder slides downward in the central hole of the guide cylinder, it plays a guiding role, so that the force-applying cylinder presses down vertically, so that the deformation of the sealing gasket is consistent at all points on the circumference, ensuring that the sealing gasket is pressed evenly, and overcoming the problem of partial misassembly of the guide in the prior art.

[0025] (2) In this invention, by utilizing the driving gear to drive the driven gear to rotate, the torque can be amplified, thus saving effort and overcoming the problem of inconvenience caused by the need for a long wrench in traditional clamps. The entire clamp has a simple structure, is easy to operate, and is easy to manufacture.

[0026] (3) In this invention, by providing a first annular oil reservoir and a second annular oil reservoir on the top surface of the force-applying cylinder, and storing grease to lubricate the bottom surfaces of the driving gear and the driven gear, the friction between the driving gear, the driven gear and the top surface of the force-applying cylinder is reduced, thereby further saving effort. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

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

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

[0030] Figure 3 A schematic diagram illustrating the assembly of a low-pressure turbine guide using conventional fixtures;

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

[0032] Figure 5 A perspective view of the fixture for assembling a low-pressure turbine guide provided by the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the base plate in this invention;

[0034] Figure 7 for Figure 6 Sectional view of AA;

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

[0036] Figure 9 This is a top view of the pull rod in this invention;

[0037] Figure 10 This is a schematic diagram of the positioning block in this invention;

[0038] Figure 11 This is a schematic diagram of the force-applying cylinder in this invention;

[0039] Figure 12 for Figure 11 Middle BB cross-section;

[0040] Figure 13 This is a schematic diagram of the guide cylinder in this invention;

[0041] Figure 14 This is a schematic diagram of the driven gear in this invention;

[0042] Figure 15 This is a cross-sectional view of the driven gear in this invention;

[0043] Figure 16 This is a schematic diagram of the drive gear in this invention;

[0044] Figure 17 This is a schematic diagram of the column assembly in this invention;

[0045] Figure 18 This is a schematic diagram of the gear limiting component in this invention;

[0046] Figure 19 This is a schematic diagram of assembling a low-pressure turbine guide using the fixture provided by the present invention.

[0047] Reference numerals: 1. Base plate; 2. Positioning block; 3. Guide cylinder; 3a. Circular ring plate; 3b. Cylinder body; 4. Force-applying cylinder; 4a. Sliding fit section; 4b. Pressing section; 4c. First mounting hole; 4d. Second mounting hole; 4e. First annular oil reservoir; 4f. Second annular oil reservoir; 5. Tie rod; 6. Driven gear; 6a. Insertion part; 7. Drive gear; 7a. Insert rod; 7b. Wrench rotating rod; 8. Gear cover; 9. Gear limiting component; 9a. Upper plate body; 9b. Lower plate body; 9c. Arc-shaped connecting plate; 10. Column assembly; 10a. Upper flange body; 10b. Steel pipe; 10c. Lower flange body; 11. Lifting eye bolt; 100. Guide; 200. Outer casing; 300. Sealing gasket. Detailed Implementation

[0048] 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 only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

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

[0050] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0051] Combination Figures 4 to 18 As shown, this embodiment also provides a fixture for assembling a low-pressure turbine guide, including a base plate 1 and a force-applying cylinder 4; multiple column assemblies 10 are evenly distributed in a ring on the base plate 1; a guide cylinder 3 is installed at the top of the multiple column assemblies 10, and the force-applying cylinder 4 is slidably installed in the central hole of the guide cylinder 3; multiple positioning blocks 2 are evenly distributed in a ring on the top surface of the base plate 1; the positioning blocks 2 are provided with arc-shaped positioning stops 2a, and the arc-shaped positioning stops 2a of all 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 configured as a threaded rod 5a, and the threaded rod 5a cooperates with the threaded hole at 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-applying cylinder 4, with the second mounting hole 4d located at the center of the top plate of the force-applying cylinder 4; an insert 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 wrench rotating rod 7b being used to cooperate with a wrench; the insert rod 7a is rotatably inserted into the first mounting hole 4c; a plug-in part 6a is provided at the center of the bottom surface of the driven gear 6, and the plug-in part 6a is rotatably inserted into 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 rotations of the driving gear 7 is less than the number of teeth of the driven gear 6. Therefore, by using the driving gear 7 to drive the driven gear 6 to rotate, the torque can be amplified, which saves effort and overcomes the problem of inconvenience caused by the need for a long wrench in traditional clamps.

[0054] In this embodiment, a first annular oil reservoir 4e is provided on the top surface of the force-applying cylinder 4. The first annular oil reservoir 4e is concentrically arranged with the first mounting hole 4c, and grease is stored in the first annular oil reservoir 4e for lubricating the bottom surface of the drive gear 7. A plurality of second annular oil reservoirs 4f are provided on the top surface of the force-applying cylinder 4. The second annular oil reservoirs 4f are concentrically arranged with the second mounting hole 4d, and grease is stored in the second annular oil reservoirs 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-applying cylinder 4 is reduced, further reducing the effort required.

[0056] In this embodiment, the outer cylindrical surface of the force-applying cylinder 4 is stepped, including a sliding fit section 4a and a pressing section 4b; the sliding fit section 4a is slidably fitted with the center 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.

[0057] Combination Figure 5 , Figure 18 As shown, multiple gear limiting components 9 are installed on the top surface of the force-applying cylinder 4. Each gear limiting component 9 is a Z-shaped component 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-applying cylinder 4, and the upper plate 9a rests on the top surface of the driven gear 6, with the bottom surface of the upper plate 9a slidingly engaging with the top surface of the driven gear 6. The gear limiting components 9 also serve to limit the axial movement of the driven gear 6.

[0058] Combination Figure 5 As shown, a gear cover 8 is screwed to the top surface of the force-applying cylinder 4, and the gear cover 8 covers the driving gear 7. The wrench rotating rod 7b of the driving gear 7 extends out from the central 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 Figure 13 As shown, the guide cylinder 3 includes an integrally formed annular plate 3a and a cylinder 3b; the force-applying cylinder 4 is slidably fitted with the central hole of the cylinder 3b; the annular plate 3a is connected to the column assembly 10.

[0060] Combination Figure 17As shown, the column assembly 10 includes an upper flange 10a, a steel pipe 10b, and a lower flange 10c. The top and bottom of the upper flange 10a and lower flange 10c are integrally formed with protruding posts. The protruding post at the top of the upper flange 10a is inserted into the annular plate 3a of the guide cylinder 3, and the flange edge of the upper flange 10a is screwed to the annular plate 3a. The protruding post at the bottom of the upper flange 10a is inserted into the central hole at the top of the steel pipe 10b and welded thereon. The protruding post at the top of the lower flange 10c is inserted into the central hole at the bottom of the steel pipe 10b and welded thereon. The protruding post at the bottom of the lower flange 10c is inserted into the base plate 1, and the flange edge of the lower flange 10c is screwed to the base plate 1.

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

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

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

[0064] S2. Place the outer casing 200 in the 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. Then, place the guide 100 and the sealing gasket 300 into the outer casing 200 in sequence.

[0065] S3. Install the assembly consisting of the force-applying 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 to 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. Continue to rotate the drive gear 7 in the forward direction and drive the driven gear 6 to rotate. The driven gear 6 moves downward along the pull rod 5, causing the force-applying cylinder 4 to slide downward in the center hole of the guide cylinder 3, so that the pressing section 4b of the force-applying cylinder 4 extends into the outer casing 200 and presses the sealing gasket 300.

[0067] After the S5 and guide 100 are assembled, the drive gear 7 is rotated in the opposite direction, causing the driven gear 6 to move upward along the pull rod 5 axis, driving the force-applying 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 disengages from the threaded hole of the driven gear 6, the assembly consisting of the force-applying cylinder 4, drive gear 7 and driven gear 6 can be removed from the fixture, and the assembly consisting of the outer casing 200, guide 100 and sealing gasket 300 can be taken out.

[0068] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A fixture for assembling a low-pressure turbine guide vane, characterized in that, It includes a base plate (1) and a force-applying cylinder (4); multiple column assemblies (10) are evenly distributed in a ring on the base plate (1). A guide cylinder (3) is installed at the top of multiple column assemblies (10), and the force-applying cylinder (4) is slidably installed in the center hole of the guide cylinder (3); Multiple positioning blocks (2) are evenly distributed in a ring on the top surface of the base plate (1); the positioning blocks (2) are provided with arc-shaped positioning stops (2a), and the arc-shaped positioning stops (2a) of all 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). The upper part of the pull rod (5) is configured as a threaded rod (5a), and the threaded rod (5a) is engaged with the threaded hole at the center of the driven gear (6). 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). A rod (7a) is integrally formed on the bottom surface of the drive gear (7), and a wrench rotating rod (7b) is integrally formed on the top surface; the rod (7a) is rotatably inserted into the first mounting hole (4c); A plug-in portion (6a) is provided at the center of the bottom surface of the driven gear (6), and the plug-in portion (6a) is rotatably inserted into the second mounting hole (4d); The outer cylindrical surface of the force-applying cylinder (4) is stepped, including a sliding fit section (4a) and a pressing section (4b); the sliding fit section (4a) is slidably fitted with the center 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). The guide cylinder (3) includes an integrally formed annular plate (3a) and a cylinder (3b); the force-applying cylinder (4) is slidably fitted with the center hole of the cylinder (3b); the annular plate (3a) is connected to the column assembly (10).

2. The fixture for assembling a low-pressure turbine guide as described in claim 1, characterized in that, A first annular oil reservoir (4e) is provided on the top surface of the force-applying cylinder (4). The first annular oil reservoir (4e) is concentrically arranged with the first mounting hole (4c). Grease is stored in the first annular oil reservoir (4e) for lubricating the bottom surface of the drive gear (7). Multiple second annular oil reservoirs (4f) are provided on the top surface of the force-applying cylinder (4). The second annular oil reservoirs (4f) are concentrically arranged with the second mounting hole (4d), and grease is stored in the second annular oil reservoirs (4f) for lubricating the bottom surface of the driven gear (6).

3. The fixture for assembling a low-pressure turbine guide as described in claim 1, characterized in that, Multiple gear limiting components (9) are installed on the top surface of the force-applying cylinder (4); the gear limiting component (9) is a component with a Z-shaped cross-section 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-applying 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) slides in cooperation with the top surface of the driven gear (6).

4. A fixture for assembling a low-pressure turbine guide as described in claim 1, characterized in that, A gear cover (8) is screwed to the top surface of the force-applying cylinder (4), and the gear cover (8) covers the drive gear (7). The wrench rotating rod (7b) of the drive gear (7) extends out from the center hole of the gear cover (8).

5. A fixture for assembling a low-pressure turbine guide as described in claim 1, characterized in that, The column assembly (10) includes 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 integrally formed with protruding columns; The protruding post at the top of the upper flange body (10a) is inserted into 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 protruding post at the bottom of the upper flange body (10a) is inserted into the central hole at the top of the steel pipe (10b) and welded. The protruding post at 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 thereon; the protruding post at the bottom of the lower flange body (10c) is inserted into the base plate (1), and the flange edge of the lower flange body (10c) is screwed to the base plate (1).

6. A fixture for assembling a low-pressure turbine guide as described in claim 1, characterized in that, A lifting eye screw (11) is installed at the top of the column assembly (10).

7. A method for assembling a low-pressure turbine guide vane, characterized in that, The clamp according to any one of claims 1 to 6 comprises the following steps: S1. Remove the assembly consisting of the force-applying cylinder (4), the driving gear (7), and the driven gear (6) from the fixture; S2. Place the outer casing (200) in the 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 place the guide (100) and sealing gasket (300) into the outer casing (200) in sequence. S3. Install the assembly consisting of the force-applying cylinder (4), the driving gear (7) and the driven gear (6) into the center hole of the guide cylinder (3), rotate the driving gear (7) in the forward direction to 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 drive gear (7) in the forward direction and drive the driven gear (6) to rotate. The driven gear (6) moves downward along the pull rod (5) axis, causing the force-applying cylinder (4) to slide downward in the center hole of the guide cylinder (3), so that the pressing section (4b) of the force-applying cylinder (4) extends into the outer casing (200) and presses the sealing gasket (300). S5. After the guide (100) is assembled, the drive gear (7) is rotated in the opposite direction, so that the driven gear (6) moves upward along the pull rod (5) axis, 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), drive gear (7) and driven gear (6) can be removed from the fixture, and the assembly consisting of the outer casing (200), guide (100) and sealing gasket (300) can be taken out.

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