A positioning fixture for welding process of steam turbine blade

Abstract

The application belongs to the technical field of clamp equipment, and particularly relates to a positioning clamp for turbine blade welding processing; the positioning clamp comprises a base and a clamping seat, the clamping seat is fixedly installed on the base, and the clamping seat is used for clamping a blade root of a turbine blade; an annular seat is fixedly connected to a surface of the clamping seat, a pair of circumferentially-slidable sliding blocks are connected to a surface of the annular seat, sliding rods are fixedly connected to the sliding blocks, and sliding mechanisms are slidably connected to surfaces of the sliding rods; the sliding mechanisms comprise moving rings, a pair of clamping assemblies are connected to inner sides of the moving rings, the two clamping assemblies are slidably connected to the two sliding rods respectively, and the clamping assemblies are used for clamping the turbine blade; a cylinder is fixedly installed on the clamping seat, and a piston rod of the cylinder is fixedly connected to the moving ring; through cooperation of the clamping assemblies and the sliding mechanisms, the turbine blade can be clamped and fixed in multiple angles and multiple directions, the position of the blade in the welding process is ensured to be stable, welding deformation is reduced, and processing precision is improved.

Description

Technical Field

[0001] This invention relates to the field of fixture equipment technology, and in particular to a positioning fixture for welding turbine blades. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto the blades, causing the rotor, which is equipped with rows of blades, to rotate and perform work. During the production of steam turbines, welding operations are required on the blades, either at the blade body or the blade root.

[0003] During the welding process, the blade root has a relatively regular shape, making it easy to clamp and fix. However, because the blade body is curved and tilted, it has no flat surface as a reference plane, making it difficult to fix properly. This can easily cause the blade body to move during welding, affecting the quality of the blade welding. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a positioning fixture for welding turbine blades. By incorporating a moving ring and a clamping assembly, the turbine blades are clamped and positioned, thereby resolving the problems in the prior art.

[0005] To achieve the above-mentioned technical objectives, the specific technical solution of the present invention is as follows: The present invention proposes a positioning fixture for welding and processing steam turbine blades, comprising: a base and a clamping seat, the clamping seat being fixedly installed on the base and used to clamp the blade root of the steam turbine blade; an annular seat is fixedly connected to the surface of the clamping seat, and a pair of circumferentially sliding sliders are connected to the surface of the annular seat, a sliding rod is fixedly connected to the slider, and a sliding mechanism is slidably connected to the surface of the sliding rod; the sliding mechanism includes a moving ring, and a pair of clamping components are connected to the inner side of the moving ring, the two clamping components being slidably connected to the two sliding rods respectively, and the clamping components being used to clamp the steam turbine blade; a cylinder is fixedly installed on the clamping seat, and the piston rod of the cylinder is fixedly connected to the moving ring.

[0006] As a preferred embodiment of the present invention, the clamping assembly includes a sliding sleeve, which is slidably connected to a sliding rod. An arc-shaped seat is provided on the outer surface of the sliding sleeve, and a sliding block is slidably connected to the surface of the arc-shaped seat. A clamping plate is fixedly connected to the surface of the sliding block, and a clamping groove is provided on the surface of the clamping plate.

[0007] As a preferred embodiment of the present invention, a movable frame is slidably connected in the clamping groove, a toothed column is fixedly connected on the movable frame, and an arc-shaped rack is fixedly connected on the arc-shaped seat, the rack being able to engage with the toothed column.

[0008] As a preferred embodiment of the present invention, a pair of clamping blocks are symmetrically connected on both sides of the clamping plate, the clamping blocks extend into the clamping groove, a pair of rotating frames are rotatably connected to the surface of the sliding block, a first connecting rod is hinged between the rotating frame and the clamping block, and a second connecting rod is hinged between the rotating frame and the moving frame.

[0009] As a preferred embodiment of the present invention, a positioning column is fixedly connected to the movable frame, the positioning column is slidably connected to the top of the clamping plate, and an elastic element is connected between the movable frame and the top of the clamping groove, the elastic element being connected to the surface of the positioning column.

[0010] As a preferred embodiment of the present invention, the inner side of the movable ring is provided with an annular groove, and the surface of the sliding sleeve is connected with a limiting block that is slidably connected to the annular groove.

[0011] As a preferred embodiment of the present invention, a toothed ring is fixedly connected to the surface of the annular seat, a bracket is fixedly connected to the surface of the slider, a locking bolt is connected to the surface of the bracket, and a toothed block that engages with the toothed ring is connected to the lower end of the locking bolt.

[0012] As a preferred embodiment of the present invention, the surface of the clamp is provided with a sliding hole, a pair of sliding blocks are slidably connected in the sliding hole, and a positioning block is fixedly connected on the sliding block for clamping and positioning the blade root of the steam turbine blade.

[0013] As a preferred embodiment of the present invention, a drive motor is fixedly installed on the side of the clamp, and a lead screw is fixedly connected to the shaft of the drive motor. The lead screw has a pair of threads in opposite directions on its surface, and two slides are respectively threaded to both ends of the lead screw.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. This invention, through the cooperation of the clamping component and the sliding mechanism, can clamp and fix the turbine blades at multiple angles and directions, ensuring the stability of the blade position during welding, reducing welding deformation, and improving processing accuracy.

[0016] 2. The interlocking structure of the rack and pinion in the clamping assembly of the present invention, as well as the buffering effect of the elastic element, make the clamping process more stable and avoid the blade from loosening due to external impact. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a positioning fixture for welding turbine blades proposed in this invention.

[0018] Figure 2 This is a schematic diagram of the clamp structure proposed in this invention.

[0019] Figure 3 This is a schematic diagram of the clamp proposed in this invention from another angle.

[0020] Figure 4 This is a schematic diagram of the sliding mechanism proposed in this invention.

[0021] Figure 5 This is a schematic diagram of the clamping assembly proposed in this invention.

[0022] Figure 6 This is a schematic diagram of the clamping assembly proposed in this invention from another angle.

[0023] Figure 7 This is a bottom view of the clamping assembly proposed in this invention.

[0024] The corresponding names of the reference numerals in the figure are as follows: 1. Base; 2. Clamp; 21. Drive motor; 22. Lead screw; 23. Slide; 24. Positioning block; 25. Annular seat; 26. Gear ring; 27. Slider; 28. Slide rod; 29. ​​Gear block; 210. Locking bolt; 211. Sliding hole; 212. Bracket; 3. Sliding mechanism; 31. Moving ring; 32. Annular groove; 33. Clamping assembly; 331. Sliding sleeve; 332. Arc seat; 333. Sliding block; 334. Clamping plate; 335. Clamping block; 336. Clamping groove; 337. Moving frame; 338. Rack; 339. Gear column; 3310. First connecting rod; 3311. Rotating frame; 3312. Limiting block; 3313. Positioning column; 3314. Elastic element; 3315. Second connecting rod; 4. Cylinder. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] Example: This example discloses a positioning fixture for welding turbine blades, such as... Figures 1-7 As shown, it includes: a base 1 and a clamp 2. The clamp 2 is fixedly installed on the base 1 and is used to clamp the root of the turbine blade. An annular seat 25 is fixedly connected to the surface of the clamp 2. A pair of sliders 27 that can slide circumferentially are connected to the surface of the annular seat 25. A sliding rod 28 is fixedly connected to the slider 27. A sliding mechanism 3 is slidably connected to the surface of the sliding rod 28. The sliding mechanism 3 is used to clamp and fix the blade body of the turbine blade.

[0027] like Figures 2-3As shown, the clamp 2 has a sliding hole 211 on its surface, and a pair of sliding blocks 23 are slidably connected in the sliding hole 211. A positioning block 24 is fixedly connected to the sliding block 23 for clamping and positioning the turbine blade root. A drive motor 21 is fixedly installed on the side of the clamp 2, and a lead screw 22 is fixedly connected to the shaft of the drive motor 21. The lead screw 22 is located on the back of the clamp 2, and a pair of threads in opposite directions are provided on the surface of the lead screw 22. The two sliding blocks 23 are threaded to the two ends of the lead screw 22 respectively. The drive motor 21 drives the lead screw 22 to rotate. When the lead screw 22 rotates, it drives the two sliding blocks 23 to move closer to each other, thereby driving the two positioning blocks 24 to clamp and position the turbine blade root.

[0028] like Figures 4-5As shown, the sliding mechanism 3 includes a moving ring 31, with a pair of clamping components 33 connected to the inner side of the moving ring 31. The two clamping components 33 are slidably connected to two slide rods 28 respectively, and the clamping components 33 are used to clamp the two sides of the turbine blade. A cylinder 4 is fixedly installed on the clamping seat 2, and the piston rod of the cylinder 4 is fixedly connected to the moving ring 31. The sliding mechanism 3 moves through the extension and retraction of the cylinder 4. The clamping component 33 includes a sliding sleeve 331, which is slidably connected to the slide rods 28. An arc-shaped seat 332 is provided on the outer surface of the sliding sleeve 331, and a sliding block 333 is slidably connected to the surface of the arc-shaped seat 332. A clamping plate 334 is fixedly connected to the surface of the moving block 333. The surface of the clamping plate 334 is provided with a clamping groove 336, which is an inclined groove that matches the shape of the steam turbine blade. The steam turbine blade is clamped in the clamping groove 336, and the orientation of the clamping plate 334 can be adjusted by moving the sliding block 333, which can clamp and position the steam turbine blades at different angles. A movable frame 337 is slidably connected in the clamping groove 336. The movable frame 337 has an L-shaped or U-shaped structure. A toothed column 339 is fixedly connected to the movable frame 337. An arc-shaped rack 338 is fixedly connected to the arc-shaped seat 332. The center of the rack 338 is aligned with the arc-shaped seat 332. The centers of the two blades coincide, and the rack 338 can engage with the toothed column 339. A pair of clamping blocks 335 are symmetrically connected on both sides of the clamping plate 334. The clamping blocks 335 are used to clamp the surface of the turbine blades. The clamping blocks 335 extend into the clamping groove 336. A pair of rotating frames 3311 are rotatably connected to the surface of the sliding block 333. The rotating frames 3311 have a V-shaped structure. A first connecting rod 3310 is hinged between the rotating frames 3311 and the clamping blocks 335, and a second connecting rod 3315 is hinged between the rotating frames 3311 and the moving frame 337. Since the width of the turbine blades gradually increases in the direction away from the blade root, when the clamping assembly 33 moves away from the blade root... When moving in the root direction, the blade pusher moving frame 337 moves towards the arc-shaped seat 332, causing the toothed column 339 to engage with the rack 338, thereby automatically locking the angle of the clamping plate 334. During the movement of the moving frame 337, it drives the rotating frame 3311 to rotate. When the rotating frame 3311 rotates, it drives the two clamping blocks 335 to move closer to each other, automatically clamping and fixing the turbine blade. In this embodiment, the cylinder 4 drives the moving ring 31 to move the clamping assembly 33 synchronously, realizing the rapid clamping and release of the turbine blade, improving welding efficiency, and ensuring that the turbine blade is clamped stably during welding and will not deform.

[0029] Preferably, a positioning post 3313 is fixedly connected to the movable frame 337. The positioning post 3313 is slidably connected to the top of the clamping plate 334. An elastic element 3314 is connected between the movable frame 337 and the top of the clamping groove 336. The elastic element 3314 is connected to the surface of the positioning post 3313. When the toothed post 339 and the rack 338 are engaged, the elastic element 3314 is in a compressed state. The elastic element 3314 plays the role of resetting the movable frame 337. A limit nut is threaded to one end of the positioning post 3313 to prevent the positioning post 3313 from separating from the clamping plate 334.

[0030] Preferably, the inner side of the moving ring 31 is provided with an annular groove 32, and the surface of the sliding sleeve 331 is connected with a limiting block 3312 that is slidably connected to the annular groove 32, so that the clamping component 33 can slide along the circumference of the moving ring 31, and when the cylinder 4 drives the moving ring 31 to move, it can drive the two clamping components 33 to move together.

[0031] Preferably, a toothed ring 26 is fixedly connected to the surface of the annular seat 25, and a bracket 212 is fixedly connected to the surface of the slider 27. A locking bolt 210 is threadedly connected to the surface of the bracket 212. A toothed block 29 that engages with the toothed ring 26 is rotatably connected to the lower end of the locking bolt 210. The locking bolt 210 drives the toothed block 29 to engage with the toothed ring 26, thereby fixing the position of the slider 27 and thus fixing the position of the clamping assembly 33 on the moving ring 31.

[0032] Working principle: The drive motor 21 drives the lead screw 22 to rotate. When the lead screw 22 rotates, it causes the two slides 23 to move closer together, which in turn causes the two positioning blocks 24 to clamp and position the turbine blade root. Then, the cylinder drives the moving ring 31 and the clamping assembly 33 to move away from the clamping seat 2. During the movement of the clamping assembly 33, the turbine blade side presses the moving frame 337 to move closer to the arc-shaped seat 332, so that the toothed column 339 and the rack 338 engage, thereby automatically locking the angle of the clamping plate 334. During the movement of the moving frame 337, it drives the rotating frame 3311 to rotate. When the rotating frame 3311 rotates, it causes the two clamping blocks 335 to move closer together, automatically clamping and fixing the turbine blade, making the clamping process more stable and avoiding the blade from loosening due to external impact. This ensures that the turbine blade will not deform during welding and improves the welding accuracy. In addition, this embodiment can adapt to different types of turbine blades by adjusting the position of the slider 27 and the clamping angle of the clamping assembly 33, and is suitable for various welding processing scenarios.

[0033] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positioning fixture for welding turbine blades, characterized in that, include: The base (1) and the clamp (2) are fixedly installed on the base (1) and the clamp (2) is used to clamp the root of the turbine blade; The clamp (2) is fixedly connected to an annular seat (25), and the annular seat (25) is connected to a pair of sliders (27) that can slide in the circumferential direction. The sliders (27) are fixedly connected to a sliding rod (28), and the sliding rod (28) is slidably connected to a sliding mechanism (3). The sliding mechanism (3) includes a moving ring (31), and a pair of clamping components (33) are connected to the inner side of the moving ring (31). The two clamping components (33) are slidably connected to the two slide rods (28) respectively, and the clamping components (33) are used to clamp the turbine blades. A cylinder (4) is fixedly installed on the clamp (2), and the piston rod of the cylinder (4) is fixedly connected to the moving ring (31); The clamping assembly (33) includes a sliding sleeve (331), which is slidably connected to the sliding rod (28). An arc-shaped seat (332) is provided on the outer surface of the sliding sleeve (331), and a sliding block (333) is slidably connected to the surface of the arc-shaped seat (332). A clamping plate (334) is fixedly connected to the surface of the sliding block (333), and a clamping groove (336) is provided on the surface of the clamping plate (334). A movable frame (337) is slidably connected in the groove (336), a toothed column (339) is fixedly connected on the movable frame (337), and an arc-shaped rack (338) is fixedly connected on the arc-shaped seat (332). The rack (338) can engage with the toothed column (339). A pair of clamping blocks (335) are symmetrically connected on both sides of the clamping plate (334). The clamping blocks (335) extend into the clamping groove (336). A pair of rotating frames (3311) are rotatably connected to the surface of the sliding block (333). A first connecting rod (3310) is hinged between the rotating frame (3311) and the clamping block (335), and a second connecting rod (3315) is hinged between the rotating frame (3311) and the moving frame (337).

2. A positioning fixture for welding turbine blades according to claim 1, characterized in that, A positioning column (3313) is fixedly connected to the movable frame (337). The positioning column (3313) is slidably connected to the top of the clamping plate (334). An elastic element (3314) is connected between the movable frame (337) and the top of the clamping groove (336). The elastic element (3314) is connected to the surface of the positioning column (3313).

3. A positioning fixture for welding turbine blades according to claim 2, characterized in that, The inner side of the movable ring (31) is provided with an annular groove (32), and the surface of the sliding sleeve (331) is connected with a limiting block (3312) that is slidably connected to the annular groove (32).

4. A positioning fixture for welding turbine blades according to claim 3, characterized in that, A toothed ring (26) is fixedly connected to the surface of the annular seat (25), and a bracket (212) is fixedly connected to the surface of the slider (27). A locking bolt (210) is connected to the surface of the bracket (212), and a toothed block (29) that engages with the toothed ring (26) is connected to the lower end of the locking bolt (210).

5. A positioning fixture for welding turbine blades according to claim 4, characterized in that, The clamp (2) has a sliding hole (211) on its surface. A pair of sliding blocks (23) are slidably connected in the sliding hole (211). A positioning block (24) is fixedly connected on the sliding block (23) for clamping and positioning the blade root of the steam turbine blade.

6. A positioning fixture for welding turbine blades according to claim 5, characterized in that, The clamp (2) is fixedly mounted on the side of the drive motor (21), and the shaft of the drive motor (21) is fixedly connected to the lead screw (22). The surface of the lead screw (22) is provided with a pair of threads in opposite directions, and the two slides (23) are respectively threaded to the two ends of the lead screw (22).

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