A turbine blade clamping tool for a tooth-shaped blade root

Abstract

This utility model discloses a moving blade clamping fixture for a toothed blade root of a steam turbine. Several T-shaped grooves are evenly distributed on the upper surface of the worktable. Each screw has a head at its bottom, with two screws corresponding to one T-shaped groove. The heads of two screws in the same group are located in two T-shaped grooves respectively. Four screws are respectively inserted through the four corners of the bottom support plate. There are several first and second middle support plates. Two screws from one group pass through both ends of the first middle support plate, and two screws from the other group pass through both ends of the second middle support plate. There are two top support plates, each connected to a corresponding screw. A locking nut is connected to the top of each screw, pressing against the upper surface of the top support plate. This utility model has a reasonable structure. When the first and second middle support plates are inserted into the toothed grooves of the blade root, they can support each toothed plate of the blade root, ensuring stability during drilling.

Description

Technical Field

[0001] This utility model relates to the technical field of moving blade clamping fixtures for toothed blade roots, specifically a moving blade clamping fixture for a steam turbine toothed blade root. Background Technology

[0002] Blades are the general term for the steel used in the moving and stationary blades of a steam turbine. Blades are key components of a steam turbine, and also one of the most delicate and important components. They withstand the combined effects of high temperature, high pressure, enormous centrifugal force, steam force, steam excitation force, corrosion and vibration, and water droplet erosion in the wet steam zone under extremely harsh conditions.

[0003] The bottom of the moving blade is generally connected to the connecting frame around the turbine rotor via a blade root. Blade roots have various structures; one type uses toothed plates to form grooves for connection with the connecting frame. However, this connection structure typically requires connecting holes in the toothed plates. Currently, the moving blade clamping fixture for turbine toothed blade roots typically uses two jaws for clamping. However, when this clamping structure has holes, it relies solely on the strength of the toothed plates themselves for support, resulting in poor stability. Therefore, an improved technology is urgently needed to solve this problem in the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a moving blade clamping fixture for toothed blade roots of steam turbines, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a moving blade clamping fixture for a toothed blade root of a steam turbine, comprising a worktable and a clamping assembly. The clamping assembly includes screws, a bottom support plate, a first middle support plate, a second middle support plate, a top support plate, and a locking nut. The worktable has several T-shaped grooves evenly distributed on its upper surface. Each screw has a head at its bottom. There are at least four screws arranged in pairs, with two screws corresponding to one T-shaped groove. The heads of the two screws in the same pair are located in two T-shaped grooves respectively. The four screws are respectively inserted through the four corners of the bottom support plate. There are several first and second middle support plates. Two screws from one pair pass through both ends of the first middle support plate, and two screws from the other pair pass through both ends of the second middle support plate. There are two top support plates. The top ends of the two pairs of screws pass through their respective top support plates. Each screw top end is fitted with a locking nut, which is pressed against the upper surface of the top support plate.

[0006] Preferably, the present invention provides a moving blade clamping fixture for a toothed blade root of a steam turbine, wherein the bottom support plate has through holes at its four corners, and the first middle support plate, the second middle support plate, and the top support plate all have through holes at both ends. One set of screws passes through the through holes of the bottom support plate, the first middle support plate, and the top support plate, respectively, and another set of screws passes through the through holes of the bottom support plate, the second middle support plate, and the top support plate, respectively.

[0007] Preferably, the moving blade clamping fixture for toothed blade roots of steam turbines provided by this utility model has chamfers at the top and bottom of one end of the first middle layer support plate and the second middle layer support plate.

[0008] Preferably, the present invention provides a moving blade clamping fixture for a toothed blade root of a steam turbine, wherein a boss is provided on the outer side of the upper surface of the bottom support plate, and a groove is also provided on the upper surface of the bottom support plate.

[0009] Compared with the prior art, the beneficial effects of this utility model are: Four headed screws engage with the T-slots of the worktable. All four screws pass through the bottom support plate. The four screws are arranged in pairs, with two screws in one pair connecting to the first middle support plate and two screws in the other pair connecting to the second middle support plate. The top of each pair of screws is connected to a top support plate and a locking nut. The top of the top support plate is pressed down by the locking nut. When the first and second middle support plates are inserted into the toothed grooves of the blade root, they can support the toothed plates of the blade root, ensuring stability during drilling and preventing deformation of the toothed plates during drilling. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 For the appendix Figure 1 A schematic diagram of the right-side structure.

[0011] In the diagram: 1. Workbench; 2. Screw; 3. Bottom support plate; 4. First middle support plate; 5. Second middle support plate; 6. Top support plate; 7. Locking nut; 8. T-slot; 9. Head; 10. Boss; 11. Groove; 12. Leaf root; 13. Tooth plate; 14. Tooth groove. Detailed Implementation

[0012] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", 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 utility model 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 utility model.

[0013] Please see Figure 1-2 This utility model provides a technical solution: a moving blade clamping fixture for a toothed blade root of a steam turbine, including a worktable 1 and a clamping assembly. The clamping assembly includes screws 2, a bottom support plate 3, a first middle support plate 4, a second middle support plate 5, a top support plate 6, and a locking nut 7. The upper surface of the worktable 1 is evenly provided with several T-shaped grooves 8. Each screw 2 has a head 9 at its bottom. There are at least four screws 2, arranged in pairs, with two screws 2 corresponding to one T-shaped groove 8. The heads 9 of the two screws 2 in the same pair are located in the two T-shaped grooves 8 respectively. The four screws 2 are respectively inserted through the four corners of the bottom support plate 3. There are several first middle support plates 4 and several second middle support plates 5. Two screws 2 in one pair pass through both ends of the first middle support plate 4, and two screws 2 in the other pair pass through both ends of the second middle support plate 5. The top and bottom of one end of the first middle support plate 4 and the second middle support plate 5 are chamfered to facilitate insertion from the toothed grooves of the blade root and prevent jamming. In the toothed groove, there are two top-layer support plates 6. The top ends of two sets of screws 2 pass through their respective top-layer support plates 6. The bottom-layer support plate 3 has through holes at its four corners. The first middle-layer support plate 4, the second middle-layer support plate 5, and the top-layer support plate 6 all have through holes at both ends. One set of screws 2 passes through the through holes of the bottom-layer support plate 3, the first middle-layer support plate 4, and the top-layer support plate 6, respectively. The other set of screws 2 passes through the through holes of the bottom-layer support plate 3, the second middle-layer support plate 5, and the top-layer support plate 6, respectively. 3. The through holes of the first middle layer support plate 4, the second middle layer support plate 5 and the top layer support plate 6 are used to realize the insertion of the screw 2. Each screw 2 is connected to a locking nut 7 at its top end. The locking nut 7 is pressed against the upper surface of the top layer support plate 6. The outer side of the upper surface of the bottom layer support plate 3 is provided with a boss 10 and a groove 11. The boss 10 is used to adapt to the toothed plate with varying width, and the groove 11 is provided so that the tool can touch the bottom layer support plate 3 when the surface is drilled.

[0014] Usage and Principle: Based on the tooth spacing of the blade root 12, select a suitable bottom support plate 3 and middle support plate. The height of one end of the bottom support plate 3 is mainly determined by the boss 10. If the tooth spacing of each tooth groove 14 of the blade root 12 is consistent inside and out, the first middle support plate 4 and the second middle support plate 5 can be middle support plates of the same height, and the bottom support plate 3 does not need to be equipped with a boss 10. If the tooth groove 14 of the blade root 12 is narrow at the inner end and wide at the outer end, the height of the first middle support plate 4 at the inner end needs to be higher than the height of the second middle support plate 5 at the outer end, so that the blade root 12 is in a horizontal state. Move the bottom of the blade root 12 forward along the upper surface of the bottom support plate 3, and insert the first middle support plate 4 into each tooth groove 14 of the blade root 12. Then continue to move the blade root 12 forward, and insert the second middle support plate 5 into each tooth groove 14 of the blade root 12. At this time, the opening position of the blade root 12 is located between the first middle support plate 4 and the second middle support plate 5. Finally, the two top-layer support plates 6 are respectively fitted with the two sets of screws 2, and then the locking nuts 7 are screwed onto each screw 2. Tightening the locking nuts 7 presses the nuts against the upper surface of the top-layer support plates 6, completing the installation. At this point, the toothed grooves 14 of the blade root 12 are supported by the first middle-layer support plate 4 and the second middle-layer support plate 5. During processing, the cutting tool of the drilling machine passes through the teeth of the blade root 12 sequentially from top to bottom, thus completing the drilling of the blade root 12. This utility model has a reasonable structure. It uses four screws 2 with heads 9 to cooperate with the T-shaped grooves 8 of the worktable 1. All four screws 2 pass through the bottom support plate 3. At the same time, the four screws 2 are in pairs. The two screws 2 of one pair are connected to the first middle support plate 4, and the two screws 2 of the other pair are connected to the second middle support plate 5. The top of each pair of screws 2 is connected to the top support plate 6 and the locking nut 7. The top of the top support plate 6 is pressed by the locking nut 7. When the first middle support plate 4 and the second middle support plate 5 are inserted into the tooth grooves 14 of the blade root 12, they can support the tooth plates 13 of the blade root 12, ensuring the stability when drilling and ensuring that the tooth plates 13 of the blade root 12 will not deform when drilling.

[0015] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0016] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A moving blade clamping fixture for toothed blade roots of steam turbines, characterized in that: The assembly includes a workbench (1) and a clamping assembly. The clamping assembly includes screws (2), a bottom support plate (3), a first middle support plate (4), a second middle support plate (5), a top support plate (6), and a locking nut (7). The upper surface of the workbench (1) is evenly provided with several T-shaped grooves (8). Each screw (2) has a head (9) at its bottom. There are at least four screws (2) in pairs. Two screws (2) correspond to one T-shaped groove (8). The heads (9) of the two screws (2) in the same group are located in two T-shaped grooves (8) respectively. The four screws (2) The screws (2) are respectively installed at the four corners of the bottom support plate (3). There are several of the first middle support plate (4) and the second middle support plate (5). Two screws (2) of one group pass through the two ends of the first middle support plate (4), and two screws (2) of the other group pass through the two ends of the second middle support plate (5). There are two top support plates (6). The top ends of the two groups of screws (2) pass through their respective top support plates (6). Each screw (2) is connected to a locking nut (7) at its top end. The locking nut (7) is pressed against the upper surface of the top support plate (6).

2. The moving blade clamping fixture for toothed blade roots of steam turbines according to claim 1, characterized in that: The bottom support plate (3) has through holes at its four corners. The first middle support plate (4), the second middle support plate (5) and the top support plate (6) all have through holes at both ends. One set of screws (2) passes through the through holes of the bottom support plate (3), the first middle support plate (4) and the top support plate (6) respectively. The other set of screws (2) passes through the through holes of the bottom support plate (3), the second middle support plate (5) and the top support plate (6) respectively.

3. The moving blade clamping fixture for toothed blade roots of steam turbines according to claim 1, characterized in that: The top and bottom of one end of the first middle layer support plate (4) and the second middle layer support plate (5) are both chamfered.

4. The moving blade clamping fixture for toothed blade roots of steam turbines according to claim 1, characterized in that: The outer side of the upper surface of the bottom support plate (3) is provided with a boss (10), and the upper surface of the bottom support plate (3) is also provided with a groove (11).

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