Rotating blade locking structure, dismounting method and steam turbine

Abstract

The application provides a rotating blade locking structure, a dismounting method and a steam turbine, comprising a blade and a disc, the blade has a blade root, the disc is provided with a disc groove, the blade root is installed in the disc groove, and at least two locking members are further included, one end of the locking member is provided with a convex head, the lower surface of the blade root is provided with a plurality of grooves, and the convex head of the at least two locking members is clamped in the grooves. The application adopts at least two locking members, the end of the at least two locking members is provided with a convex head, the lower surface of the blade root is provided with a plurality of grooves, the convex heads of the two locking members can be abutted and clamped in the grooves together or separately. When the blade root moves to a certain groove along the axial direction, the locking member can be loaded into the groove or taken out from the groove, then the blade is continuously pushed along the axial direction, the locking members in the remaining grooves are installed or taken out, the interval between the adjacent discs is reduced, and the dismounting efficiency of the blade is improved.

Description

Technical Field

[0001] This invention relates to the field of turbine blade assembly technology, and in particular to a rotating blade locking structure, a disassembly and assembly method, and a turbine. Background Technology

[0002] The blades of a disc-type gas turbine are typically mounted axially. The blade root and the groove on the disc are machined into a dovetail shape. During installation, the blade root is first placed in the space between two adjacent discs, and then slid into the groove along its direction. The blade root is fixed circumferentially and radially by the fit between it and the groove. To prevent axial movement of the blade during operation and subsequent collision with the stator, axial positioning and locking are also required. In existing technologies, common axial positioning and locking structures include riveting and locking plates. Riveting damages the blade structure, and the removed blades cannot be reused. Locking plates, after being installed in the blade root and groove, are fixed by interlocking with the two sides of the disc through bent ends, thus achieving axial fixation between the blade root and the disc. Although the locking plate structure does not damage the blade structure, it has limitations during disassembly and assembly, especially during maintenance and replacement. The blade can only be axially removed after the locking plate is removed. For a typical locking plate structure, its length is generally longer than the axial length of the blade root (the length of the locking plate is the length of the blade root plus the bending length of two locking plates). Therefore, a large axial space is required between the rotor discs. Otherwise, the blade cannot be replaced without disassembling the rotor.

[0003] To address the aforementioned issues, the prior art, disclosed in publication number CN210371330U, discloses a blade locking structure comprising a blade and a wheel. The blade has a blade root, and the wheel has a groove in which the blade root is installed. It also includes a locking plate, the lower surface of which engages with the bottom surface of the groove, thus fixing the locking plate within the groove along the axial direction of the wheel. The lower surface of the blade root is in close contact with the upper surface of the locking plate. The installation of the locking plate and the blade is independent. Therefore, the axial extension of the space between adjacent wheel disks for inserting the blade only needs to be slightly greater than the length of the blade root to achieve the desired assembly. This blade locking structure reduces the axial space between adjacent wheel disks to a certain extent. Specifically, this invention adds a groove and a protrusion between the blade root and the groove, increasing the friction points and thus reducing the length of the bent portion of the locking plate, thereby reducing the distance between adjacent wheel disks. However, the distance between adjacent wheel disks still requires the length of at least one blade root and two bent portions, so the distance can still be reduced. Simultaneously, it improves the efficiency of blade assembly and disassembly. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a rotating blade locking structure, a disassembly and assembly method, and a steam turbine, which are used to further reduce the spacing between adjacent disks in the steam turbine, thereby reducing the overall volume of the steam turbine, while improving the disassembly and assembly efficiency of the blades.

[0005] To achieve the above objectives, the present invention provides a rotating blade locking structure, comprising a blade and a wheel, wherein the blade has a blade root, the wheel has a wheel groove, the blade root is installed in the wheel groove, and the structure further comprises at least two locking members, one end of each locking member having a protrusion, and the lower surface of the blade root having a plurality of grooves, the protrusions of the at least two locking members being engaged in the plurality of grooves; the lower surface of the locking member is in contact with the bottom surface of the wheel groove, and the lower surface of the blade root is in contact with the upper surface of the locking member.

[0006] Preferably, the groove is formed at the center of the lower surface of the leaf root; the number of grooves is one.

[0007] Preferably, the locking member is elongated, the protrusion is located at the end of the locking member, and there are two locking members, with the protrusions of the two locking members abutting each other and engaging in the groove.

[0008] Preferably, the number of grooves is not less than the number of locking elements, and several of the grooves are formed on both sides of the center position of the lower surface of the blade root.

[0009] Preferably, the locking member is elongated, and the protrusion is located at the end of the locking member, with the protrusions of at least two locking members engaging in the grooves in a one-to-one correspondence.

[0010] Preferably, the end of any of the locking members away from the protrusion extends out of the wheel groove and bends downward to form a bent portion, the bent portion abutting against the side of the wheel groove.

[0011] Preferably, the ends of all the locking members away from the protrusions extend out of the wheel groove and bend downward to form a bend, the bend abutting against the side of the wheel groove.

[0012] To achieve the above or other objectives, the present invention also discloses a method for assembling and disassembling a rotating blade, employing the aforementioned rotating blade locking structure, the steps of which are as follows:

[0013] S1. Install the blade; engage the protrusions of at least two locking elements in several grooves, and slide the blade root after engaging the locking elements into the wheel groove along the axial direction of the wheel groove until the blade root is completely slid into the wheel groove.

[0014] S2. Remove the blade; slide the blade root out of the wheel groove along the axial direction of the wheel groove. Once any locking component has completely slid out of the wheel groove, disassemble it; continue to slide the blade root out of the wheel groove until the remaining blade root part has completely slid out of the wheel groove, and then disassemble the remaining locking components.

[0015] To achieve the above or other objectives, the present invention also discloses a steam turbine including the aforementioned rotating blade locking structure.

[0016] As described above, the rotating blade locking structure, disassembly and assembly method, and steam turbine of the present invention have the following beneficial effects:

[0017] The rotating blade locking structure, disassembly and assembly method, and steam turbine involved in this invention employ at least two locking components, each with a protruding end. Several grooves are provided on the lower surface of the blade root. The protruding ends of the two locking components can abut against each other and engage in the grooves, or they can engage separately in the grooves. Thus, during blade installation or disassembly, the blade is pushed along the axial direction of the wheel groove. When the blade root moves axially to a certain groove, a locking component can be inserted into that groove or removed. Then, the blade is continued to be pushed axially to install or remove the remaining locking components from the grooves. In other words, the distance between adjacent wheel discs only needs to be slightly greater than the length of one blade root plus the length of one bend to complete the blade installation and disassembly, further reducing the distance between adjacent wheel discs and thus reducing the size of the steam turbine. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connection between the blade root and the wheel groove in the prior art of this invention;

[0019] Figure 2 This is a connection diagram of the rotating blade locking structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the connection between the blade root and the locking member of the rotating blade locking structure of the present invention in a first embodiment;

[0021] Figure 4 , Figure 5 This is a spatial schematic diagram of the locking element of the rotating blade locking structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the connection between the blade root and the locking member of the rotating blade locking structure of the present invention in a second embodiment.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Leaf blade; 11. Leaf root; 110. Lower surface of leaf root; 111. Groove;

[0025] 2. Locking component; 21. Bending part; 22. Upper surface of locking component; 23. Lower surface of locking component; 24. Protruding head;

[0026] 3. Wheel groove; 31. Bottom surface of the wheel groove. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0028] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0029] like Figure 1 This is a schematic diagram of the installation of a turbine blade 1 and a turbine disk in the prior art. The blade root 11 of the blade 1 and the groove 3 on the turbine disk are machined into a dovetail shape. A groove 111 is formed at the center of the bottom surface of the blade root 11. The locking member 2 is elongated and has a protrusion 24 at its center. During installation, the protrusion 24 of the locking member 2 is first engaged in the groove 111 of the blade root 11, and then the blade root 11 is placed into the space between two adjacent turbine disks. Figure 1 At point L in the middle, the blade root 11 is slid into the wheel groove 3 along the direction of the wheel groove 3, and the part of the locking member 2 extending out of the wheel groove 3 is bent downwards, with the bent part 21 closely attached to the side wall of the wheel groove 3, to axially position the blade 1. The radial and circumferential fixation of the blade 1 is achieved by the dovetail-shaped wheel groove 3 and the blade root 11. Because both ends of the locking member 2 need to be bent, the distance L between adjacent wheel discs is not less than the length of one blade root 11 plus the length of two bent parts 21.

[0030] like Figures 2-6As shown, the present invention discloses a rotating blade locking structure, including a blade 1 and a wheel. The blade 1 has a blade root 11 at its bottom, and the wheel has a wheel groove 3 on its outer periphery. The blade root 11 is installed in the wheel groove 3. The structure also includes at least two locking members 2. One end of each locking member 2 has a protrusion 24. The bottom surface of the blade root 11 has several grooves 111. The protrusions 24 of the at least two locking members 2 are engaged in the grooves 111. The lower surface 23 of the locking member is in contact with the bottom surface 31 of the wheel groove, and the lower surface 110 of the blade root is in contact with the upper surface 22 of the locking member.

[0031] The rotary blade locking structure disclosed in this invention involves, in use, engaging the protrusion 24 of at least one locking member 2 in the groove 111 of the lower surface 110 of the blade root, then placing the locking member 2 together with the blade 1 into the space between adjacent discs, and then sliding the locking member 2 and the blade 1 into the wheel groove 3 along the axial direction of the wheel groove 3. When one of the locking members 2 is completely slid into the wheel groove 3, the remaining locking member 2 is engaged again in the groove 111 until the locking member 2 and the blade root 11 are completely slid into the wheel groove 3. After all locking parts 2 are fully inserted into the wheel groove 3, the lower surface 23 of the locking parts is in contact with the bottom surface 31 of the wheel groove, and the lower surface 110 of the blade root is in contact with the upper surface 22 of the locking parts. Thus, through the contact friction between the lower surface 23 of the locking parts and the bottom surface 31 of the wheel groove, the contact friction between the upper surface 22 of the locking parts and the lower surface 110 of the blade root, and the relatively fixed assembly relationship between the locking parts 2 and the wheel groove 3 along the axial direction of the wheel, the blade root 11 can be fixed in the wheel groove 3 along the axial direction of the wheel, effectively preventing the blade 1 from moving axially relative to the wheel.

[0032] Preferred, such as Figure 4 , Figure 5 As shown, to increase the axial stability of the blade 1 on the wheel disk, the portion of any locking member 2 extending from the protrusion 24 beyond the wheel groove 3 is bent downwards to form a bend 21, which abuts against the side of the wheel groove 3. The bend 21 abuts against the side of the wheel groove 3, thus increasing the blocking force of the bend 21 between the blade root 11 and the wheel groove 3, in addition to contact friction, ensuring the axial stability of the blade 1 relative to the wheel disk. More preferably, if only one locking member 2 has its end bent downwards to form a bend 21, this bend 21 should be positioned upstream of the wheel disk relative to the other locking member 2. That is, this bend 21 is used to counteract the thrust exerted on the blade 1 by steam flowing downstream, ensuring the axial stability of the blade 1 on the wheel disk. More preferably, as... Figure 2 As shown, the portions of all locking parts 2 that extend out of the wheel groove 3 away from the protrusion 24 are bent downward to form a bent portion 21, and the bent portion 21 abuts against the side of the wheel groove 3.

[0033] Preferred, such as Figures 2-5As shown, this invention provides an embodiment in which a groove 111 is formed at the center of the lower surface 110 of the leaf root; the number of grooves 111 is one. The locking member 2 is elongated, with a protrusion 24 disposed at one end of the locking member 2; the number of locking members 2 is two, and the protrusions 24 of the two locking members 2 abut against each other and engage in the groove 111. In this embodiment, the width of the groove 111 is slightly greater than the sum of the thicknesses of the two protrusions 24, meaning that the two protrusions 24, after abutting against each other, are engaged in the groove 111 without any movement.

[0034] The rotating blade locking structure in this embodiment can be installed and disassembled in the following two ways:

[0035] Method 1: When installing blade 1, first abut the protrusions 24 of the two locking pieces 2 together and then lock them together in the groove 111 on the lower surface 110 of the blade root. Then, place the blade 1 together with the two locking pieces 2 between the adjacent discs. Slide the blade root 11 and the locking pieces 2 into the wheel groove 3 along the axial direction of the wheel groove 3. After the blade root 11 has completely slid into the wheel groove 3, bend the parts of the two locking pieces 2 that extend out of the wheel groove 3 downward to form a bent part 21 that fits against the side of the wheel groove 3. The bent part 21, the protrusions 24, and the groove 111 together limit the axial direction of the blade 1.

[0036] When disassembling blade 1, the bent portions 21 of the two locking parts 2 are restored to straight sections using a tool. Then, blade 1 is pushed axially to one side, and blade root 11, together with locking parts 2, slides out of wheel groove 3. When one of the locking parts 2 has completely slid out, the protrusion 24 of the locking part 2 is removed from the groove 111 of the lower surface 110 of the blade root, thereby removing the locking part 2. Continue pushing blade 1 until the remaining locking parts 2 slide out of wheel groove 3.

[0037] Method 2: When installing blade 1, first place the protrusion 24 of one of the locking parts 2 into the groove 111 of the lower surface 110 of the blade root, and then place the locking part 2 together with the blade 1 between the adjacent discs. Slide the blade root 11 and the locking part 2 into the wheel groove 3 along the axial direction of the wheel groove 3. When the locking part 2 is completely slid into the wheel groove 3 (the protrusion 24 is completely slid into the wheel groove 3, but the groove 111 is not completely slid into the wheel groove 3) or partially slid into the wheel groove 3 (the protrusion 24 is not completely slid into the wheel groove 3), engage the protrusion 24 of the other locking part 2 in the groove 111, and the protrusions 24 of the two locking parts 2 abut against each other. Continue sliding the blade root 11 until it is completely inserted into the wheel groove 3, and bend the protruding parts of the two locking pieces 2 downward to form a bent part 21 that fits against the side of the wheel groove 3. The bent part 21, the protrusion 24, and the groove 111 together limit the axial movement of the blade 1.

[0038] When disassembling blade 1, the bent portions 21 of the two locking parts 2 are restored to straight sections using a tool. Then, blade 1 is pushed axially to one side, and blade root 11, together with locking parts 2, slides out of wheel groove 3. When one of the locking parts 2 has completely slid out, the protrusion 24 of the locking part 2 is removed from the groove 111 of the lower surface 110 of the blade root, thereby removing the locking part 2. Continue pushing blade 1 until the remaining locking parts 2 slide out of wheel groove 3.

[0039] In this embodiment, method two is preferred, that is, the two locking parts 2 are installed separately during installation, so that the distance L between adjacent discs can be reduced to slightly greater than the length of a blade root 11 plus the length of a bend 21.

[0040] Preferred, such as Figure 6 As shown, the present invention also provides another embodiment, wherein the number of grooves 111 is not less than the number of locking members 2, and a plurality of grooves 111 are formed on the lower surface 110 of the leaf root. The locking member 2 is elongated, and a protrusion 24 is provided at the end of the locking member 2, and at least two protrusions 24 of the locking member 2 are engaged in the grooves 111 in a one-to-one correspondence. In this embodiment, there are two grooves 111 and two locking members 2, and the width of the groove 111 is slightly greater than the thickness of the protrusion 24, that is, the protrusion 24 will not move when engaged in the groove 111.

[0041] The rotating blade locking structure in this embodiment can be installed and disassembled in the following two ways:

[0042] Method 1: When installing blade 1, firstly, engage the protrusions 24 of the two locking parts 2 into the two grooves 111 on the lower surface 110 of the blade root, then place the blade 1 together with the two locking parts 2 between adjacent discs, and slide the blade root 11 and locking parts 2 into the wheel groove 3 along the axial direction of the wheel groove 3. After the blade root 11 and the two locking parts 2 have slid into the wheel groove 3, bend the protruding parts of the two locking parts 2 downward to form a bent part 21 that fits against the side of the wheel groove 3. The bent part 21, the protrusions 24, and the grooves 111 together limit the axial direction of the blade 1.

[0043] When disassembling blade 1, the bent portions 21 of the two locking parts 2 are restored to straight sections using a tool. Then, blade 1 is pushed axially to one side, and blade root 11, together with locking parts 2, slides out of wheel groove 3. When one of the locking parts 2 has completely slid out, the protrusion 24 of the locking part 2 is removed from the groove 111 of the lower surface 110 of the blade root, thereby removing the locking part 2. Continue pushing blade 1 until the remaining locking parts 2 slide out of wheel groove 3.

[0044] Method 2: When installing blade 1, first place the protrusion 24 of one of the locking parts 2 into the corresponding groove 111 on the lower surface 110 of the blade root. Then, place the locking part 2 along with the blade 1 between adjacent discs. Slide the blade root 11 and the locking part 2 into the wheel groove 3 along the axial direction of the wheel groove 3. When the locking part 2 is completely slid into the wheel groove 3, the groove 111 that the other locking part 2 needs to engage with is on the outside of the wheel groove 3. Engage the protrusion 24 of the other locking part 2 into the corresponding groove 111, and continue to slide the blade root 11 until it is completely slid into the wheel groove 3. Bend the protruding parts of the two locking parts 2 downward to form a bent part 21 that fits against the side of the wheel groove 3. The bent part 21, the protrusion 24, and the groove 111 together limit the axial direction of the blade 1.

[0045] When disassembling blade 1, the bent portions 21 of the two locking parts 2 are restored to straight sections using a tool. Then, blade 1 is pushed axially to one side, and blade root 11, together with locking parts 2, slides out of wheel groove 3. When one of the locking parts 2 has completely slid out, the protrusion 24 of the locking part 2 is removed from the groove 111 of the lower surface 110 of the blade root, thereby removing the locking part 2. Continue pushing blade 1 until the remaining locking parts 2 slide out of wheel groove 3.

[0046] In this embodiment, method two is preferred, that is, the two locking parts 2 are installed separately during installation, so that the distance L between adjacent discs can be reduced to slightly greater than the length of a blade root 11 plus the length of a bend 21.

[0047] Furthermore, the protrusion 24 and groove 111 in this invention can be rectangular or other shapes, as long as they can be positioned to engage with each other. The number of protrusions 24 on the locking member 2 and grooves 111 on the lower surface 110 of the leaf root can be several, as long as each locking member 2 has at least one protrusion 24 engaging with it.

[0048] To achieve the above or other objectives, the present invention also discloses a method for assembling and disassembling a rotating blade, employing the aforementioned rotating blade locking structure, the steps of which are as follows:

[0049] A1. Install the blade 1; First, engage the protrusions 24 of at least two locking members 2 into several grooves 111. Then, place the blade 1, after engaging the locking members 2, between the two discs. Next, slide the blade root 11 of the blade 1 into the wheel groove 3 along the axial direction of the wheel groove 3 until the blade root 11 is completely inserted into the wheel groove 3. Then, bend the portion of the locking member 2 extending out of the wheel groove 3 downward to form a bent portion 21 that fits against the side of the wheel groove 3. The bent portion 21, the protrusions 24, and the grooves 111 together limit the axial movement of the blade 1. Further, the number of locking members 2 is two, and the number of grooves 111 is one or at least two. The specific installation method is the same as the installation method of the rotating blade locking structure in the two embodiments above.

[0050] A2. Disassemble blade 1; First, use a tool to straighten the bent portions 21 at both ends of the locking member 2, then slide the blade 1 out of the wheel groove 3 along the axial direction of the wheel groove 3. Once any locking member 2 has completely slid out of the wheel groove 3, disassemble that locking member 2; continue to slide the blade root 11 out of the wheel groove 3 until the remaining locking members 2 have completely slid out of the wheel groove 3, then disassemble the remaining locking members 2. Further, the number of locking members 2 is two, and the number of grooves 111 is one or at least two. The specific disassembly method is the same as the disassembly method of the rotating blade locking structure in the above two embodiments.

[0051] To achieve the above or other objectives, the present invention also provides a steam turbine including the aforementioned rotating blade locking structure.

[0052] The rotating blade locking structure, disassembly and assembly method, and steam turbine disclosed in this invention improve upon the existing one-piece locking component 2 by replacing it with a two-piece locking component 2. When installing or removing the blade 1, half of the locking component 2 can be installed or removed first, thus reducing the distance L between adjacent rotors to only the length of one blade root 11 plus the length of one bend 21. This reduces the space between adjacent rotors and the size of the steam turbine. Furthermore, the length of the two-piece locking component 2 is much shorter than that of the one-piece locking component 2, making it easier to insert or remove between adjacent rotors, resulting in higher efficiency in disassembly and installation. The two-piece locking component 2 disclosed in this invention facilitates disassembly and assembly, overcoming the problem of not being able to disassemble the blade 1 when there is insufficient axial space. Additionally, it avoids the damage to the blade 1 caused by the riveting method used in the prior art, allowing the blade 1 to be reused and reducing maintenance costs.

[0053] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for assembling and disassembling a rotating blade, comprising a rotating blade locking structure, the rotating blade locking structure including a blade (1) and a wheel, the blade (1) having a blade root (11), the wheel having a wheel groove (3), the blade root (11) being installed in the wheel groove (3), characterized in that: It also includes at least two locking parts (2), one end of which is provided with a protrusion (24), and the lower surface (110) of the blade root is provided with a plurality of grooves (111), and the protrusions (24) of at least two locking parts (2) are engaged in the plurality of grooves (111); the lower surface (23) of the locking part is in contact with the bottom surface (31) of the wheel groove, and the lower surface (110) of the blade root is in contact with the upper surface (22) of the locking part; In use, the protrusion (24) of at least one locking member (2) is engaged in the groove (111) of the lower surface (110) of the blade root, and then the locking member (2) together with the blade (1) is placed in the space between adjacent discs. Then the locking member (2) and the blade (1) are slid into the wheel groove (3) along the axial direction of the wheel groove (3). When one of the locking members (2) is completely slid into the wheel groove (3), the remaining locking member (2) is engaged in the groove (111) again until the locking member (2) and the blade root (11) are completely slid into the wheel groove (3). The end of any of the locking members (2) away from the protrusion (24) extends out of the wheel groove (3) and bends downward to form a bend (21), the bend (21) abutting against the side of the wheel groove (3); if only one locking member (2) has its end bent downward to form a bend (21), this bend (21) should be in the upstream direction of the wheel disk relative to the other locking member (2), this bend (21) is used to counteract the thrust of steam flowing from upstream to downstream on the blade (1) and ensure the axial stability of the blade (1) on the wheel disk; The steps are as follows: S1. Install blade (1); engage the protrusions (24) of at least two locking parts (2) in several grooves (111), and slide the blade root (11) after engaging the locking parts (2) into the wheel groove (3) along the axial direction of the wheel groove (3) until the blade root (11) is completely slid into the wheel groove (3); S2. Remove the blade (1); slide the blade root (11) out of the wheel groove (3) along the axial direction of the wheel groove (3). When any locking part (2) is completely slid out of the wheel groove (3), remove it; continue to slide the blade root (11) out of the wheel groove (3) until the remaining blade root (11) is completely slid out of the wheel groove (3), and remove the remaining locking part (2).

2. The method for disassembling and assembling rotating blades according to claim 1, characterized in that: The groove (111) is formed at the center of the lower surface (110) of the leaf root; the number of the groove (111) is one.

3. The method for disassembling and assembling rotating blades according to claim 2, characterized in that: The locking member (2) is long and narrow, and the protrusion (24) is located at the end of the locking member (2). There are two locking members (2), and the protrusions (24) of the two locking members (2) abut against each other and are engaged in the groove (111).

4. The method for disassembling and assembling rotating blades according to claim 1, characterized in that: The number of grooves (111) is not less than the number of locking elements (2), and several of the grooves (111) are formed on the lower surface (110) of the leaf root.

5. The method for disassembling and assembling rotating blades according to claim 4, characterized in that: The locking member (2) is long and narrow, and the protrusion (24) is located at the end of the locking member (2). The protrusions (24) of at least two locking members (2) are engaged in the groove (111) in a one-to-one correspondence.

6. The method for disassembling and assembling rotating blades according to claim 1, characterized in that: All the locking elements (2) have their ends away from the protrusion (24) extending out of the wheel groove (3) and bent downward to form a bend (21), which abuts against the side of the wheel groove (3).

7. A steam turbine, characterized in that: The invention includes a rotating blade locking structure, wherein the rotating blade locking structure is connected to the steam turbine using the rotating blade disassembly and assembly method described in any one of claims 1-6.

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