A special tool and method for installing a lock line on a gas turbine turbine blade

Abstract

The present invention discloses a special tool and method for installing a lock line on a gas turbine rotor blade. The special tool comprises: a support structure including a tail end adapted to abut against a gas seal tooth slot of a turbine wheel; a drive structure including a rotating shaft rotatably mounted on the support structure about its own axis, an operating handle fixedly connected to both ends of the rotating shaft, and a drive member, wherein both the drive member and the operating handle laterally protrude from the rotating shaft; wherein the operating handle swings to drive the drive member via the rotating shaft to have an entry state and an exit state. In the entry state, the drive member is adapted to swing toward a first hanging ear slot and / or a second hanging ear slot to drive a lock line located on the drive member to move toward the first hanging ear slot and the second hanging ear slot and reach a preset position. The first hanging ear slot is provided on the blade root slot hanging ear, and the second hanging ear slot is provided on the blade root hanging ear. The openings of the first hanging ear slot and the second hanging ear slot both face the gas seal tooth slot. This can improve the installation efficiency of the lock line.

Description

Technical Field

[0001] The present invention relates to the technical field of turbine blades, and in particular to a special tool and method for installing a locking line for a turbine moving blade of a gas turbine. Background Art

[0002] Turbine blades are one of the core components of a gas turbine and serve as the carrier for converting the thermal energy of the gas into mechanical energy. The blade root of a turbine blade is where the blade is assembled to the turbine disc and is generally fir-tree shaped. Each blade root slot and blade root is equipped with a lug structure. After the blade root is axially inserted into the blade root slot on the turbine disc, the circumferential locking wire is placed into the lug slot and secured with a pin, completing the installation of the turbine blade. Turbine blades operate in harsh environments and must withstand high temperatures and high stresses. Therefore, service turbine blades require regular inspection and replacement: old blades are removed, new blades are installed, and new locking wires are installed.

[0003] In the prior art, the method for installing a new lock wire is as follows: different people use a crowbar to pry the hard lock wire at multiple positions along the circumference of the turbine wheel, so that the lock wire moves toward the bottom of the lug slot and eventually enters the bottom of the slot. After the lock wire enters the bottom of the slot, it needs to be maintained for a period of time until the pin is installed.

[0004] However, the shortcoming of the lock wire installation method in the prior art is that when different people pry the lock wire, the distance between the lock wire and the bottom of the groove will be different, resulting in the entire circle of lock wire being closed with a longer or shorter margin, which requires repeated removal and reinstallation, resulting in low lock wire installation efficiency.

[0005] In view of the above-mentioned deficiencies, it is necessary to design a special tool and method for installing the lock line of the gas turbine turbine moving blades. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is that when different people use a crowbar to pry the lock wire, the distance between the lock wire and the bottom of the groove will be different, resulting in a longer or shorter margin when the entire circle of lock wire is closed, which requires repeated removal and reinstallation, resulting in low lock wire installation efficiency, thereby providing a special tool and method for installing the lock wire of a gas turbine turbine blade.

[0007] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0008] A special tool for installing a lock line on a gas turbine blade, the special tool comprising:

[0009] A support structure, the support structure including a tail end adapted to abut against a gas seal tooth groove of a turbine wheel;

[0010] The driving structure includes a rotating shaft mounted on the support structure and rotating around its own axis, an operating handle and a driving member fixedly connected to both ends of the rotating shaft, and the driving member and the operating handle both protrude laterally from the rotating shaft; wherein,

[0011] The operating handle swings to drive the driving member to have an entry state and an exit state through the rotating shaft. In the entry state, the driving member is suitable for swinging toward the first hanging ear slot and / or the second hanging ear slot to drive the locking line located on the driving member to move toward the first hanging ear slot and the second hanging ear slot and reach a preset position. The first hanging ear slot is opened on the blade root slot hanging ear, and the second hanging ear slot is opened on the blade root slot. The openings of the first hanging ear slot and the second hanging ear slot are both facing the air seal tooth slot. In the exit state, the driving member exits the first hanging ear slot and / or the second hanging ear slot.

[0012] Furthermore, the actuating surface on the driving member is an arc-shaped surface, and the actuating surface faces the locking wire and pushes the locking wire into the first hanging ear slot and the second hanging ear slot.

[0013] Furthermore, the rotating shaft is mounted on the support structure via a bearing having a ratchet mechanism.

[0014] Furthermore, it also includes a limiting structure, which includes a first limiting structure and a second limiting structure. The first limiting structure is installed at the head end of the support structure, and the bottom surface of the abutting portion of the first limiting structure is suitable for abutting against the top surface of the angel wing on the turbine blade. The second limiting structure is installed near the tail end of the support structure, and the positioning member of the second limiting structure is suitable for abutting against the spoke surface of the turbine wheel. The abutting portion and the positioning member are respectively located on opposite sides of the support structure.

[0015] Furthermore, a side of the positioning member facing the spoke surface is designed to imitate the spoke surface so that the positioning member is fitted into the spoke surface.

[0016] Furthermore, the support structure includes a main arm and a holder connected to the tail end of the main arm, the rotating shaft, the first limiting structure and the second limiting structure are all installed on the main arm, and the holder is provided with a limiting groove that is embedded in the air sealing tooth groove.

[0017] Furthermore, the card seat is detachably connected to the main arm, and / or the first limiting structure is detachably connected to the main arm, and / or the second limiting structure includes a connecting piece, one end of which is detachably connected to the main arm, and the other end is detachably connected to the positioning piece.

[0018] Furthermore, the driving member, the first limiting structure, the positioning member and the holder are all made of high-purity nickel, and / or the rotating shaft, the operating handle and the connecting member are all made of aluminum alloy.

[0019] The technical solution of the present invention has the following advantages:

[0020] 1. The present invention provides a special tool for installing a lock line for a gas turbine rotor blade, comprising a support structure and a drive structure, wherein the support structure comprises a tail end adapted to abut against a gas seal tooth slot of a turbine wheel; the drive structure comprises a rotating shaft rotatably mounted on the support structure around its own axis, an operating handle and a drive member fixedly connected to both ends of the rotating shaft, wherein the drive member and the operating handle both protrude laterally from the rotating shaft; wherein the operating handle swings to drive the drive member through the rotating shaft to have an entry state and an exit state, wherein in the entry state, the drive member is adapted to swing toward a first hanging ear slot and / or a second hanging ear slot to drive the lock line located on the drive member to move toward the first hanging ear slot and the second hanging ear slot and reach a preset position, wherein the first hanging ear slot is provided on the blade root slot hanging ear, and the second hanging ear slot is provided on the blade root slot hanging ear. The first and second lug slots are opened on the blade root lug, and the openings of the first and second lug slots are both facing the air seal tooth slot. In the exit state, the driving member exits the first and / or second lug slots. In this way, when the operating handle swings a predetermined angle, the driving member can be driven to swing a predetermined angle by the rotating shaft, and then the lock wire can be driven to move a predetermined distance toward the bottom of the lug slot, so that the gap between the lock wire and the first and second lug slots is a preset gap. Finally, when the lock wire is closed, the length of the lock wire is appropriate and there is no need to repeatedly remove and reinstall it, thereby improving the installation efficiency of the lock wire. In addition, the operating handle can be used to drive the driving member to swing through the rotating shaft, so that a person can easily push the lock wire into the first and second lug slots with one hand, thereby reducing the physical labor intensity of the lock wire installation.

[0021] 2. The present invention provides a specialized tool for installing a locking wire for a gas turbine blade. The actuating surface on the driving member is an arcuate surface. The actuating surface faces the locking wire and pushes the locking wire into the first and second hanging lug slots. This allows the locking wire to be pushed into the first and second hanging lug slots by the driving member more smoothly.

[0022] 3. The present invention provides a special tool for installing a lock line for a gas turbine turbine blade. The rotating shaft is mounted on a support structure via a bearing having a ratchet mechanism. This ensures that the driving member is maintained at a preset angle without relying on manpower to maintain the operating handle and the driving member at the preset angle. This allows one person to operate multiple special tools arranged along the circumference of the turbine wheel, thereby saving labor costs.

[0023] 4. The present invention provides a special tool for installing the locking line of the gas turbine turbine moving blade, which also includes a limiting structure. The limiting structure includes a first limiting structure and a second limiting structure. The first limiting structure is installed at the head end of the bracket structure. The bottom surface of the abutting portion of the first limiting structure is suitable for abutting against the top surface of the angel wing on the turbine moving blade. The second limiting structure is installed near the tail end of the bracket structure. The positioning part of the second limiting structure is suitable for abutting against the spoke surface of the turbine wheel. The abutting portion and the positioning part are respectively located on opposite sides of the bracket structure. In this way, the stability of the special tool during the locking line installation process can be guaranteed.

[0024] 5. The present invention provides a special tool for installing the locking line of the turbine moving blades of a gas turbine. The support structure includes a main arm and a base connected to the rear end of the main arm. The rotating shaft, the first limiting structure and the second limiting structure are all installed on the main arm. The base is provided with a limiting groove that is embedded in the gas seal tooth groove. In this way, the special tool can be installed on the turbine wheel quickly, accurately and firmly, further improving the locking line installation efficiency.

[0025] 6. The present invention provides a special tool for installing the locking line of the turbine moving blades of a gas turbine, wherein the holder is detachably connected to the main arm, and / or the first limiting structure is detachably connected to the main arm, and / or the second limiting structure includes a connecting piece, one end of the connecting piece is detachably connected to the main arm, and the other end is detachably connected to the positioning piece. In this way, on the one hand, the convenience of maintenance and replacement can be improved, and on the other hand, by replacing the holder, the first limiting structure and the second limiting structure of different specifications, the special tool can be used for the locking line installation of all three-stage turbine moving blades, thereby improving the utilization rate of the special tool.

[0026] 7. The present invention provides a special tool for installing the lock line of the turbine moving blades of a gas turbine. The driving part, the first limiting structure, the positioning part and the clamping seat are all made of high-purity elemental nickel. The hardness of high-purity elemental nickel alloy is softer than that of nickel-based high-temperature alloy. It will not cause damage to the lock line, turbine moving blades, turbine impeller and other components due to collisions, and will not introduce impurity pollution to cause hidden dangers such as recrystallization of the turbine moving blades during service.

[0027] A method for installing a lock line for a gas turbine turbine blade, using the aforementioned special tooling for installing a lock line for a gas turbine turbine blade, comprises the following steps:

[0028] Install the special tooling: Place the rear end of the bracket structure in contact with the gas seal tooth slot of the turbine wheel, so that the drive member is located directly below the opening of the first hanging ear slot and / or the second hanging ear slot, and place the locking wire on the drive member;

[0029] Pushing the lock wire to move: pushing the operating handle to drive the driving member to swing into the first hanging ear slot and / or the second hanging ear slot through the rotating shaft. During the swinging process of the driving member, the lock wire is pushed to move into the first hanging ear slot and the second hanging ear slot and reach a preset position;

[0030] Locking the locking wire: Locking the locking wire in the first hanging ear slot and the second hanging ear slot.

[0031] Furthermore, when installing the special tooling, the following steps are also included:

[0032] Insert the first limiting structure into the support structure so that the bottom surface of the abutting portion of the first limiting structure abuts against the top of the angel wing on the turbine blade; insert the second limiting structure into the support structure so that the positioning member of the second limiting structure abuts against the spoke surface of the turbine wheel.

[0033] Furthermore, one special tool is installed on each side of the locking mouth of the locking line, and 6 to 8 identical special installation tools are installed along the circumference of the turbine wheel, and one special tool is installed on each side of the locking mouth of the locking line.

[0034] 1. The present invention provides a method for installing a lock wire for a gas turbine rotor blade, comprising the following steps: installing a special tool: bringing the tail end of the support structure into contact with the gas seal tooth slot of the turbine wheel, so that the driving member is located directly below the opening of the first hanging ear slot and / or the second hanging ear slot, and the lock wire is placed on the driving member; pushing the lock wire to move: pushing the operating handle to drive the driving member to swing into the first hanging ear slot and / or the second hanging ear slot via the rotating shaft, and during the swinging process of the driving member, pushing the lock wire to move into the first hanging ear slot and the second hanging ear slot and reach a preset position; locking the lock wire: locking the lock wire in the first hanging ear slot and the second hanging ear slot, thereby ensuring that the gap between the lock wire and the first hanging ear slot and the second hanging ear slot is the preset gap, thereby improving the installation efficiency of the lock wire. In addition, the operating handle can be used to drive the driving member to swing via the rotating shaft, and the lock wire can be easily pushed into the first hanging ear slot and the second hanging ear slot by one hand, thereby reducing the physical labor intensity of the lock wire installation.

[0035] 2. The present invention provides a method for installing a locking line for a gas turbine turbine blade, further comprising the following steps: inserting a first limiting structure into a support structure so that the bottom surface of a supporting portion of the first limiting structure abuts against the top surface of an angel wing on the turbine blade; inserting a second limiting structure into the support structure so that the positioning member of the second limiting structure abuts against the spoke surface of the turbine wheel; in this way, during the locking line installation process, the stability of the special tooling can be ensured, and the installation effect and efficiency can be guaranteed.

[0036] 3. The present invention provides a method for installing a locking wire for a gas turbine blade, in which six to eight identical special installation tools are arranged at intervals along the circumferential direction of the turbine wheel, and a special tool is installed on each side of the locking mouth of the locking wire. In this way, the locking wire can be pushed at multiple locations, reducing the difficulty of installing the locking wire, while ensuring the convenience and firmness of the locking mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A partial enlarged view of the turbine wheel involved in the present invention;

[0039] Figure 2 A partial enlarged view of the cooperation between the turbine wheel and the turbine blade involved in the present invention;

[0040] Figure 3 Schematic diagram of the structure of the turbine blade involved in the present invention;

[0041] Figure 4 This is a schematic perspective structural diagram of a special tool for installing a lock line on a gas turbine blade according to the present invention;

[0042] Figure 5 This is a schematic diagram of the three-dimensional structure of a special tool for installing a lock line on a gas turbine blade according to the present invention, shown from another angle.

[0043] Description of reference numerals:

[0044] 1. Turbine wheel; 11. Recessed portion; 111. Gas seal tooth slot; 12. Protruding portion; 121. Blade root slot; 13. Blade root slot lug; 131. First lug slot; 14. Radial surface; 2. Turbine moving blade; 21. Moving blade root; 211. Blade root lug; 2111. Second lug slot; 22. Angel wing; 23. Side wall; 3. Special tooling; 31. Support structure; 311. Main arm; 312. Socket; 3120. Limiting slot; 32. Driving structure; 321. Rotating shaft; 322. Operating handle; 323. Driving member; 3231. Actuating surface; 33. First limiting structure; 331. Abutting portion; 34. Second limiting structure; 341. Connecting member; 342. Positioning member. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0048] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] Example

[0050] like Figures 1 to 5As shown, the turbine wheel 1 and turbine blade 2 involved in the present invention are first introduced. Specifically, the turbine wheel 1 is disc-shaped, including a recessed portion 11 located in the middle and protruding portions 12 located on both sides of the recessed portion 11. The recessed portion 11 is provided with a plurality of air-sealing tooth grooves 111 spaced apart along the axial direction of the turbine wheel 1. Each protruding portion 12 is provided with a plurality of blade root grooves 121 spaced apart along the circumferential direction of the turbine wheel 1. The spoke surface 14 of the turbine wheel 1 has a certain curvature. Each blade root groove 121 is provided with a blade root groove hanging ear 13 at both ends along the length extension direction, and the blade root groove hanging ear 13 is formed with a first hanging ear groove 131 with an opening facing the air-sealing tooth groove. The rotor blade root 21 is also provided with a blade root hanger 211, which matches the shape of the blade root slot hanger 13. A second hanger slot 2111 is also formed on the blade root hanger 211, opening toward the gas seal tooth retaining slot 111. After the rotor blade root 21 is inserted into the blade root slot 121 of the turbine disk 1 along the axial direction of the turbine disk 1, the blade root slot hanger 13 and the blade root hanger 211 engage, and the first hanger slot 131 of the blade root slot hanger 13 communicates with the second hanger slot 2111 of the blade root hanger 211. In order to prevent the blade root 21 of the moving blade from moving relative to the blade root groove 121 in the insertion direction, it is necessary to install the locking wire extending in the circumferential direction of the turbine wheel 1 into the first hanging ear groove 131 and the second hanging ear groove 2111, and insert the pin into the groove wall of the blade root groove 121 in the axial direction, so that the locking wire is located between the groove bottom of the first hanging ear groove 131 and the pin in the radial direction of the turbine wheel 1, so as to prevent the locking wire from falling off from the first hanging ear groove 131 and / or the second hanging ear groove 2111.

[0051] In order to adapt to the high-speed rotation of the turbine wheel 1, the lock wire is hard and difficult to install and adjust. Figure 4 and Figure 5 The embodiment shown provides a special tool for installing the lock line of the gas turbine turbine moving blades. The special tool 3 includes a support structure 31, a drive structure 32 and a limiting structure.

[0052] The support structure 31 includes a tail end and a head end that are arranged opposite to each other. During the locking wire installation process, the tail end abuts against the gas seal tooth groove 111 of the turbine wheel 1. In this embodiment, the support structure 31 includes a main arm 311 and a base 312 that is detachably connected to the tail end of the main arm 311. The end face of the base 312 is arc-shaped. Since the diameter of the circle where the gas seal tooth groove 111 is located is large, the arc on the end face of the base 312 is large. Figure 4The bracket 312 is provided with a limiting groove 3120 that engages with the gas seal tooth groove 111, so that the support structure 31 can be accurately and firmly mounted on the turbine wheel 1. Of course, the support structure 31 can also be formed in one piece. Specifically, the end face of the rear end of the support structure 31 is still curved, but the limiting groove 3120 is not provided. The curvature of the rear end is the same as that of the gas seal tooth groove 111. Alternatively, the end face of the rear end of the support structure 31 is not only curved, but also provided with a limiting groove 3120 that engages with the gas seal tooth groove 111, so that the support structure 31 can be accurately and firmly mounted on the turbine wheel 1.

[0053] The driving structure 32 is generally Z-shaped and includes a rotating shaft 321 rotatably mounted on the support structure 31 , an operating handle 322 and a driving member 323 respectively fixedly connected to both ends of the rotating shaft 321 .

[0054] In this embodiment, the rotating shaft 321 is mounted on the support structure 31 via a bearing having a ratchet structure. When the ratchet mechanism's latching pin is not removed, the rotating shaft 321 can only rotate in one direction and remain at a preset angle. Accordingly, the driving member 323 can also remain at a preset angle. This eliminates the need for manual effort to maintain the operating handle 322 and driving member 323 at the preset angles. A single person can operate the multiple specialized tooling 3 spaced along the circumference of the turbine disc 1, thereby saving labor costs. After the latching pin is removed, the rotating shaft 321 can rotate in both directions, including reverse rotation, thereby driving the driving member 323 out of the first mounting lug slot 131 and / or the second mounting lug slot 2111.

[0055] The grip portion of the operating handle 322 is ergonomically designed for easy grip, and the operating handle 322 protrudes laterally (here, lateral refers to the direction at an angle to the axis of the shaft) from the shaft 321, which makes manual operation easier and more labor-saving.

[0056] The drive member 323 is detachably connected to the rotating shaft 321 through the cooperation of a T-shaped block and a T-shaped track, allowing replacement of drive members 323 of different specifications. This is a common detachable connection method and will not be described in detail here. The drive member 323 protrudes laterally (here, laterally refers to the direction at an angle with the axis of the rotating shaft) from the rotating shaft 321 so that the drive member 323 can enter the first hook groove 131 and / or the second hook groove 2111 during swinging. The actuating surface 3231 of the drive member 323, which faces the locking wire and is used to push the locking wire into the first hook groove 131 and the second hook groove 2111, is an arc-shaped surface. This ensures that the actuating surface 3231 maintains stable contact with the locking wire during swinging and pushing the locking wire, thereby ensuring a relatively smooth expansion of the locking wire. In this embodiment, the drive member 323 is cam-shaped, and in a plane perpendicular to the axis of the rotating shaft, the cross-section of the drive member 323 is a smoothly connected circular and elliptical shape.

[0057] The limiting structure includes a first limiting structure 33 installed at the head end of the support structure 31 , and a second limiting structure 34 installed between the tail end of the support structure 31 and the rotating shaft 321 .

[0058] The first limiting structure 33 and the main arm 311 are detachably connected through the cooperation of the T-block and the T-track. This is a common detachable connection method and will not be described in detail here. The connection position of the first limiting structure 33 and the main arm 311 is adjustable, but can be fixed after the target position is determined. For example, by inserting a positioning screw into the T-track, the first limiting structure 33 is restricted from moving along the T-track. After the special tooling 3 is installed on the turbine wheel 1, the bottom surface of the first limiting structure 33 abuts against the top surface of the angel wing 22, so that when the driving member 323 is subjected to the reaction force of the locking line and tends to move downward, the first limiting structure 33 can be supported upward by the angel wing 22 to prevent the main arm 311 from tilting. The portion of the first limiting structure 33 that abuts the angel wing 22 is defined herein as the abutment portion 331. Preferably, the side of the abutment portion 331 abuts against the sidewall 23 of the turbine blade 2 near the root of the angel wing 22. This further constrains the dedicated tooling 3 and improves its stability. The abutment portion 331 and the driver 323 are located on the same side of the main arm 311. Alternatively, the abutment portion 331 and the driver 323 may be located on different sides of the main arm 311.

[0059] The second limiting structure 34 includes a connector 341 and a positioning member 342. One end of the connector 341 is detachably connected to the main arm 311 via a T-block and a T-track. Furthermore, the connection position of the connector 341 to the main arm 311 is adjustable and can be fixed after the target position is determined. This is a common detachable connection method and will not be described in detail here. The other end of the connector 341 is detachably connected to the positioning member 342 via threads. Alternatively, a plug-in connection can be used for detachable connection, which is not specifically limited here and can be configured according to actual needs. The positioning member 342 and the aforementioned abutment portion 331 are located on opposite sides of the support structure 31, further enhancing the stability of the special tooling 3. Furthermore, the side of the positioning member 342 facing the radial surface 14 is contoured to the radial surface 14 to ensure that the positioning member 342 and the radial surface 14 fit together, further enhancing the contact stability between the positioning member 342 and the radial surface 14. In this embodiment, in any case, preferably, the abutting portion 331 of the first limiting structure 33 and the positioning member 342 of the second limiting structure 34 are respectively located on two opposite sides of the main arm 311 so that the special tooling 3 can be supported in a balanced manner.

[0060] As a supplementary note, the drive member 323, first position-limiting structure 33, positioning member 342, and retaining member 312 are all made of high-purity elemental nickel. High-purity elemental nickel alloys are softer than nickel-based superalloys, preventing damage to components such as the lock wire, turbine blades 2, and turbine disc 1. Furthermore, they avoid introducing impurities that could cause recrystallization of the turbine blades 2 during service. Furthermore, the rotating shaft 321, main arm 311, operating handle 322, and connecting member 341 are all made of lightweight aluminum alloy.

[0061] The following describes a method for installing a locking line on a gas turbine rotor blade using a special tool for installing a locking line on a gas turbine provided in this embodiment, including the following steps:

[0062] Install the special tool 3: fit the limiting groove 3120 on the card seat 312 into the gas seal tooth card slot 111, so that the special tool 3 can be quickly and accurately inserted radially into the turbine wheel 1, so that the driving member 323 is located directly below the first hanging ear groove 131 and / or the second hanging ear groove 2111. Of course, if the card seat 312 is not provided on the support structure 31, it is necessary to abut the tail end of the support structure 31 against the top of the gas seal tooth card slot 111; plug the second limiting structure 34 into the main arm 311, so that the positioning member 342 is aligned with the main arm 311. The spokes 14 of the turbine wheel 1 are abutted against each other. When the side of the positioning member 342 facing the spokes 14 is designed to imitate the spokes 14, the positioning member 342 is engaged with the spokes 14. The first limiting structure 33 is inserted into the head end of the support structure 31 along the axial direction of the turbine wheel 1, and the position of the first limiting structure 33 is adjusted so that the bottom surface of the first limiting structure 33 abuts against the top surface of the angel wing 22. In this way, the stability of the special tooling 3 can be ensured during installation and the special tooling can be prevented from tilting. The locking wire is placed on the driving member 323.

[0063] Push the lock line to move: push the operating handle 322 to swing the operating handle 322 in the first direction, and the operating handle 322 drives the driving member 323 to enter the state through the rotating shaft 321, so that the operating handle 322 swings in the second direction, and the operating handle 322 drives the driving member 323 to exit the state through the rotating shaft 321; specifically, in the entry state, the free end of the driving member 323 is suitable for swinging toward the first hanging ear groove 131 and / or the second hanging ear groove 2111 to drive the lock line on the driving member 323 to move into the first hanging ear groove 131 and the second hanging ear groove 2111 and reach the preset position; in the exit state, the driving member The free end of 323 gradually exits the first hanging ear groove 131 and / or the second hanging ear groove 2111. In this way, when the operating handle 322 swings to a predetermined angle, the driving member 323 can be driven to swing to a predetermined angle through the rotating shaft 321. The swinging of the driving member 323 to a predetermined angle can drive the lock wire to move a preset distance into the first hanging ear groove 131 and the second hanging ear groove 2111, thereby making the gap between the lock wire and the groove bottom of the first hanging ear groove 131 and the second hanging ear groove 2111 in the radial direction of the turbine wheel 1 a preset gap. Finally, when the lock wire is closed, the length of the lock wire is appropriate, avoiding repeated disassembly and reassembly, thereby improving the lock wire. The installation efficiency is improved, and since the gap is a preset gap, it can avoid the centrifugal force during service, which may cause the lock wire to be disengaged at the lock mouth due to the large distance between the groove bottom and the lock wire, causing a great safety hazard. In particular, the rotating shaft 321 is installed on the bracket structure 31 through a bearing with a ratchet structure, and when the locking pin of the ratchet mechanism is not pulled out, after the lock wire is installed in place at a certain position along the circumferential direction of the turbine wheel 1, the driving member 323 can stay at the preset angle, and the operating handle 322 and the driving member 323 no longer need to be maintained by manpower, and people can operate the special tooling 3 at other positions. That is, one person can operate the special tooling 3 installed at Special tooling 3 at different positions on the same turbine wheel 1 is used to push the locking wires at different positions into the corresponding first hanging ear grooves 131 and second hanging ear grooves 2111, thereby saving labor costs. In addition, the operating handle 322 swings, and the driving member 323 swings through the rotating shaft 321, so that the locking wire can be easily pushed into the first hanging ear groove 131 and the second hanging ear groove 2111 by a single hand, thereby reducing the labor intensity of locking wire installation. Furthermore, since there is no need to use a crowbar to pry the locking wire during the locking wire installation process as in the prior art, there will be no damage such as collision and friction to the locking wire, the turbine wheel 1, and the turbine moving blade 2.

[0064] Repeat the steps and use the same dedicated tool 3 to push the locking wires at different locations into the corresponding first and second hanging ear grooves 131 and 2111. In this embodiment, 6 to 8 dedicated tools 3 are arranged at intervals in the recessed portion 11 along the circumference of the turbine wheel 1, and one dedicated tool 3 is arranged on each side of the locking opening of the locking wire. This allows the locking wire to be pushed at multiple locations, reducing the difficulty of locking wire installation, while ensuring the convenience and firmness of the locking opening.

[0065] Locking the lock wire: After all the lock wires have entered the preset positions in the first hanging ear slot 131 and the second hanging ear slot 2111, a positioning hole is opened on the slot wall of the blade root slot 121 along the axial direction of the turbine wheel 1, and a positioning pin is inserted into the positioning hole so that the lock wire is located between the slot bottom of the first hanging ear slot 131 and the positioning pin, and a preset distance is maintained between the lock wire and the slot bottom to prevent the lock wire from escaping from the first hanging ear slot 131 and / or the second hanging ear slot 2111, causing the rotor blade root 21 to move axially relative to the blade root slot 121, thereby creating a dangerous situation.

[0066] Remove all special tooling 3 to complete the lock wire installation.

[0067] This embodiment provides a special tool for installing the lock line of the turbine moving blades of a gas turbine. Since the first limiting structure 33, the second limiting structure 34, the holder 312, and the driving member 323 are all detachable parts, they can be replaced with corresponding specifications as needed to accommodate the installation of the lock line of all three-stage turbine moving blades.

[0068] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A special tool for installing the lock line of gas turbine turbine blades, characterized in that: The special tool (3) comprises: A support structure (31), the support structure (31) comprising a tail end adapted to abut against an air seal tooth groove (111) of a turbine wheel (1); The driving structure (32) comprises a rotating shaft (321) rotatably mounted on the support structure (31) around its own axis, an operating handle (322) and a driving member (323) respectively fixedly connected to both ends of the rotating shaft (321), wherein the driving member (323) and the operating handle (322) both protrude laterally from the rotating shaft (321); wherein, The operating handle (322) swings to drive the driving member (323) through the rotating shaft (321) to have an entry state and an exit state. In the entry state, the driving member (323) is suitable for swinging toward the first hanging ear slot (131) and / or the second hanging ear slot (2111) to drive the locking line located on the driving member (323) to move toward the first hanging ear slot (131) and the second hanging ear slot (2111) and reach a preset position. The first hanging ear slot (131) is opened on the blade root slot hanging ear (13), and the second hanging ear slot (2111) is opened on the blade root slot hanging ear (211). The openings of the first hanging ear slot (131) and the second hanging ear slot (2111) are both oriented toward the air seal tooth slot (111). In the exit state, the driving member (323) exits the first hanging ear slot (131) and / or the second hanging ear slot (2111).

2. The special tool for installing the lock line of the gas turbine turbine blade according to claim 1, characterized in that: The actuating surface (3231) on the driving member (323) is an arc-shaped surface, and the actuating surface (3231) faces the locking wire and pushes the locking wire into the first hanging ear groove (131) and the second hanging ear groove (2111).

3. The special tool for installing the lock line of the gas turbine turbine blade according to claim 1, characterized in that: The rotating shaft (321) is mounted on the support structure (31) via a bearing having a ratchet mechanism.

4. The special tool for installing the lock line of the gas turbine turbine blade according to claim 1, characterized in that: The invention also includes a limiting structure, wherein the limiting structure includes a first limiting structure (33) and a second limiting structure (34), wherein the first limiting structure (33) is installed at the head end of the support structure (31), and the bottom surface of the abutting portion (331) of the first limiting structure (33) is suitable for abutting against the top surface of the angel wing (22) on the turbine blade (2), and the second limiting structure (34) is installed on the support structure (31) near the tail end, and the positioning member (342) of the second limiting structure (34) is suitable for abutting against the spoke surface (14) of the turbine wheel (1), and the abutting portion (331) and the positioning member (342) are respectively located on opposite sides of the support structure (31).

5. The special tool for installing the lock line of the gas turbine turbine blade according to claim 4, characterized in that: The side of the positioning member (342) facing the spoke surface (14) is designed to imitate the spoke surface (14) so that the positioning member (342) and the spoke surface (14) are embedded.

6. The special tool for installing the lock line of the gas turbine turbine blade according to claim 4, characterized in that: The support structure (31) includes a main arm (311) and a holder (312) connected to the rear end of the main arm (311); the rotating shaft (321), the first limiting structure (33) and the second limiting structure (34) are all installed on the main arm (311); and the holder (312) is provided with a limiting groove (3120) suitable for being engaged with the air-sealing tooth groove (111).

7. The special tool for installing the lock line of the gas turbine turbine blade according to claim 6, characterized in that: The card holder (312) is detachably connected to the main arm (311), and / or the first limiting structure (33) is detachably connected to the main arm (311), and / or the second limiting structure (34) includes a connecting member (341), one end of the connecting member (341) is detachably connected to the main arm (311), and the other end is detachably connected to the positioning member (342).

8. The special tool for installing the lock line of the gas turbine turbine blade according to claim 7, characterized in that: The driving member (323), the first limiting structure (33), the positioning member (342) and the holder (312) are all made of high-purity nickel, and / or the main arm (311), the rotating shaft (321), the operating handle (322) and the connecting member (341) are all made of aluminum alloy.

9. A method for installing a lock line on a gas turbine blade, characterized in that: The steps include: Installing the special tool: the tail end of the support structure (31) is brought into contact with the gas seal tooth slot (111) of the turbine wheel (1), so that the driving member (323) is located directly below the opening of the first hanging ear slot (131) and / or the second hanging ear slot (2111), and the locking wire is placed on the driving member (323); Pushing the lock wire to move: pushing the operating handle (322), driving the driving member (323) to swing into the first hanging ear slot (131) and / or the second hanging ear slot (2111) through the rotating shaft (321), and during the swinging process of the driving member (323), pushing the lock wire to move into the first hanging ear slot (131) and the second hanging ear slot (2111) and reach a preset position; Locking the locking wire: locking the locking wire in the first hanging ear slot (131) and the second hanging ear slot (2111).

10. The method for installing a lock line on a gas turbine rotor blade according to claim 9, characterized in that: When installing the special tooling, the following steps are also included: The first limiting structure (33) is inserted into the support structure (31), so that the bottom surface of the abutting portion (331) of the first limiting structure (33) abuts against the top surface of the angel wing (22) on the turbine blade (2); the second limiting structure (34) is inserted into the support structure (31), so that the positioning member (342) of the second limiting structure (34) abuts against the spoke surface (14) of the turbine wheel (1).

11. The method for installing a lock line on a gas turbine rotor blade according to claim 9, wherein: Six to eight identical special installation tools (3) are arranged at intervals along the circumferential direction of the turbine wheel (1), and one special tool (3) is installed on each side of the locking opening of the locking line.

Images