Tool for assembling and removing blade root springs, and method for assembling and removing blade root springs

Abstract

A tool for assembling and removing a blade root spring that fixes a moving blade to a rotor includes: a pushing mechanism that pushes the blade root spring or a pushing rod pressed against the blade root spring; and a substrate that fixes the pushing mechanism, and a first groove portion is formed on the substrate, and the first groove portion is used to receive a reaction force when assembling or removing the blade root spring by pushing the pushing rod toward the blade root spring through the pushing mechanism to push the blade root spring.

Description

Technical Field

[0001] The present invention relates to a tool for assembling and removing a blade root spring, and a method for assembling and removing a blade root spring.

[0002] This application claims priority based on Japanese Patent Application No. 2020-67480 filed with the Japan Patent Office on April 3, 2020, and incorporates its content herein. Background Art

[0003] In a rotating machine such as a gas turbine having a rotor to which a moving blade is fixed, a blade root spring for fixing the moving blade to the rotor by pressing the moving blade toward the radially outer side of the rotor is inserted between the moving blade and the rotor. By this blade root spring, it is possible to suppress the shaking of the moving blade. In order to assemble or remove this blade root spring, conventionally, an operator has hit the blade root spring with a hammer. However, since the work place is a narrow place between turbine disks, there are problems such as poor workability and a long work time.

[0004] In view of this, Patent Document 1 discloses a tool that, although not for the purpose of assembling and removing a blade root spring, is for removing a turbine blade connecting pin that connects a turbine blade and a rotor wheel. In this tool, the tool itself is assembled to the surface of the rotor wheel using a magnet, and a plurality of push pins are sequentially inserted into a pin receiving portion provided with the turbine blade connecting pin using a hydraulic pressure and the push pins are pressed against the turbine blade connecting pin, thereby pushing out the turbine blade connecting pin from the pin receiving portion.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Patent No. 5529059 Gazette Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] In the tool of Patent Document 1, when the push pin is pressed against the turbine blade connecting pin, the magnet bears the reaction force received by the tool. However, since the blade root spring is provided to press the moving blade toward the radially outer side of the rotor, the force required to insert the blade root spring between the moving blade and the rotor or remove it from between them is significantly larger than that of the turbine blade connecting pin. In particular, when removing the blade root spring, since it is after use in a rotating machine, there is also a case where the blade root spring is sintered to the rotor, and in this case, the force required to remove the blade root spring becomes further larger. Therefore, if the tool is fixed to the rotor only by a magnet, it may not be able to bear the reaction force.

[0010] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a tool for assembling and removing a blade root spring and a method for assembling and removing a blade root spring, which can improve the efficiency of the assembling and removing operations of the blade root spring.

[0011] Solution to the problem

[0012] In order to achieve the above object, a tool for assembling and removing a blade root spring of the present invention is a tool for assembling and removing a blade root spring for fixing a moving blade to a rotor, wherein the tool for assembling and removing a blade root spring includes: a pushing mechanism that pushes the blade root spring or a pushing rod pressed against the blade root spring; and a substrate that fixes the pushing mechanism, and a first groove portion is formed on the substrate, and the first groove portion is used to receive a reaction force when the blade root spring is pushed to assemble the blade root spring or when the blade root spring is removed by pushing the pushing rod toward the blade root spring through the pushing mechanism.

[0013] In addition, a method for assembling and removing a blade root spring of the present invention is a method for assembling and removing a blade root spring for fixing a moving blade to a rotor, wherein the method for assembling and removing a blade root spring includes: a preparation step of preparing a tool, the tool including a pushing mechanism that pushes the blade root spring or a pushing rod pressed against the blade root spring, and a substrate that fixes the pushing mechanism; an installation step of installing the tool on the rotor; and a pushing step of the pushing mechanism pushing the pushing rod or the blade root spring, a first groove portion is formed on the substrate, and the first groove portion is configured to be able to receive a protrusion portion included in the rotor, and in the pushing step, by the protrusion portion abutting against the inner surface of the first groove portion, a reaction force when the blade root spring is pushed to assemble the blade root spring or when the blade root spring is removed by pushing the pushing rod toward the blade root spring through the pushing mechanism is received.

[0014] Advantageous effects of the invention

[0015] According to the tool for assembling and removing a blade root spring and the method for assembling and removing a blade root spring of the present invention, the blade root spring is pushed to assemble or remove the blade root spring by pushing the pushing rod toward the blade root spring through the pushing mechanism, so that the efficiency of the assembling and removing operations of the blade root spring can be improved. In addition, in a state where the tool is installed on the rotor, the protrusion portion included in the rotor is inserted into the first groove portion, so that the reaction force when the blade root spring is removed or when the blade root spring is pushed and assembled by pushing the pushing rod toward the blade root spring through the pushing mechanism is received by the protrusion portion abutting against the inner surface of the first groove portion. Description of the drawings

[0016] Figure 1 It is a cross-sectional view showing the structure of a connecting portion between a moving blade and a rotor in a rotating machine.

[0017] Figure 2 It is a perspective view of a blade root spring provided between a moving blade and a rotor in a rotating machine.

[0018] Figure 3 It is an upper perspective view of a tool according to an embodiment of the present invention.

[0019] Figure 4 It is a lower perspective view of a tool according to an embodiment of the present invention.

[0020] Figure 5 It is a cross-sectional view taken along the Figure 3 V-V line.

[0021] Figure 6 It is a cross-sectional view taken along the Figure 3 VI-VI line.

[0022] Figure 7 It is a perspective view of a push rod and a blade root spring used together with a tool according to an embodiment of the present invention.

[0023] Figure 8 It is a view showing a state in which a tool according to an embodiment of the present invention is fixed to a rotor.

[0024] Figure 9 It is an enlarged view of a part of tool 20 in a state where a tool according to an embodiment of the present invention is fixed to a rotor.

[0025] Figure 10 It is a cross-sectional view taken along the Figure 8 X-X line.

[0026] Figure 11 It is a view for explaining the setting of a push rod relative to a tool according to an embodiment of the present invention.

[0027] Figure 12 It is a perspective view of a state in which a blade root spring is taken out using a tool according to an embodiment of the present invention. Detailed Embodiment

[0028] Hereinafter, an assembly and removal tool for a blade root spring and an assembly and removal method for a blade root spring according to an embodiment of the present invention will be described based on the drawings. This embodiment represents one aspect of the present invention and does not limit the invention, and can be arbitrarily changed within the scope of the technical idea of the present invention.

[0029] <Blade Root Spring Assembled or Removed by the Tool and Method of the Present Invention>

[0030] As Figure 1As shown, a rotating machine such as a gas turbine has a rotatable rotor 2 to which the moving blade 1 is fixed. The moving blade 1 includes a blade portion 3 that forms a blade surface (not shown) and a blade root portion 4 provided at the end of the blade portion 3 on the side of the rotor 2. The moving blade 1 is mounted on the rotor 2 in such a manner that the blade root portion 4 is inserted into a blade groove 5 formed in the rotor 2.

[0031] A gap 6 is formed between the blade root portion 4 and the blade groove 5. The gap 6 is formed inside the blade root portion 4 in the radial direction of the rotor 2. A blade root spring 10 is inserted into the gap 6. As Figure 2 shown, the blade root spring 10 is a leaf spring having a long side direction, and has a moving blade contact surface 11 and a rotor contact surface 12. The blade root spring 10 also has a pair of curved side surfaces 13, 13 that connect the moving blade contact surface 11 and the rotor contact surface 12, and a space 14 is defined inside the blade root spring 10 in a manner extending along the long side direction through these surfaces. An opening 15 extending along the long side direction is formed in the moving blade contact surface 11.

[0032] As Figure 1 shown, when the blade root spring 10 is inserted into the gap 6, the moving blade contact surface 11 contacts the blade root portion 4, and the rotor contact surface 12 contacts the inner surface of the blade groove 5. Due to the elastic force generated by the contraction of the blade root spring 10 inserted into the gap 6 in the radial direction of the rotor 2, the moving blade 1 is pressed toward the outer side in the radial direction of the rotor 2, so that the moving blade 1 is fixed relative to the rotor 2, and the wobbling of the moving blade 1 is suppressed.

[0033] <Structure of the tool of the present invention>

[0034] Next, the structure of a tool for assembling and removing the blade root spring 10 into and from the gap 6 will be described. As Figure 3 shown, a tool 20 according to an embodiment of the present invention includes a hydraulic jack 21 as a pushing mechanism and a substrate 22 that fixes the hydraulic jack 21. As Figure 4 shown, a hole 23 for inserting the hydraulic jack 21 is formed in the substrate 22, and the hydraulic jack 21 inserted into the hole 23 is supported by a jack receiving portion 24 fixed to the lower surface 22a of the substrate 22, whereby the hydraulic jack 21 is fixed to the substrate 22. One end of a hose 25 is connected to the hydraulic jack 21, and a hydraulic pump 26 is provided on the hose 25.

[0035] As Figure 3 shown, a first groove portion 27 for receiving a reaction force generated in the subsequent operation is formed on the upper surface 22b of the substrate 22. In addition, a self-weight receiving portion 28 for receiving the self-weight of the tool 20 in the subsequent operation is provided on the upper surface 22b of the substrate 22 via a mounting portion 29. The self-weight receiving portion 28 can rotate about a shaft 30 provided in the mounting portion 29. The self-weight receiving portion 28 has a shape with a long side direction, for example, a rectangular shape in a plan view.

[0036] As shown Figure 5 in the figure, the self-weight bearing portion 28 includes an end portion 28a at the position farthest from the shaft 30 in the long side direction, and has a shape in which the thickness becomes thinner from a position A between the shaft 30 and the end portion 28a toward the end portion 28a. Thus, the lower surface 28b of the self-weight bearing portion 28 facing the upper surface 22b of the substrate 22 (refer to Figure 3 ) has a structure including a self-weight bearing surface 28d that is inclined from the position A toward the end portion 28a toward the upper surface 28c side of the self-weight bearing portion 28. As Figure 3 shown in the figure, in a state where the self-weight bearing portion 28 is rotated about the shaft 30 and the end portion 28a of the self-weight bearing portion 28 faces the first groove portion 27, that is, in a state where the direction along the inclination of the self-weight bearing surface 28d of the self-weight bearing portion 28 (refer to Figure 5 ) becomes a direction crossing the extending direction of the first groove portion 27, the self-weight bearing surface 28d is located between the first groove portion 27 and the hydraulic jack 21.

[0037] The hydraulic jack 21 has a piston portion 32 that can be expanded and contracted by hydraulic pressure. A second groove portion 31 extending in the direction of expansion and contraction of the piston portion 32 is formed on the upper surface 22b of the substrate 22 from one end opening in the hole 23. The first groove portion 27 and the second groove portion 31 cross each other at a non-90° angle. The second groove portion 31 extends in a manner that crosses the first groove portion 27 and the other end of the second groove portion 31 opens on the side surface 22c of the substrate 22.

[0038] Three hole portions 33a, 33b, and 33c extending from the side surface 22c of the substrate 22 to the first groove portion 27 are formed on the substrate 22. The hole portions 33a and the hole portions 33b, 33c are provided on opposite sides with respect to the second groove portion 31. It should be noted that the number of the hole portions is not limited to three, and may be four or more as long as they are provided on both sides of the second groove portion 31. The positioning pins 34a, 34b, and 34c can be respectively inserted into the hole portions 33a, 33b, and 33c.

[0039] As Figure 6 shown in the figure, on the inner surface 27a of the first groove portion 27, a recessed portion 35c is formed at a position corresponding to the extending direction of the hole portion 33c. When the positioning pin 34c is inserted and pressed into the hole portion 33c, the end portion of the positioning pin 34c crosses the first groove portion 27 and is inserted into the recessed portion 35c. Although not shown in the figure, on the inner surface 27a of the first groove portion 27, recessed portions having the same structure as the recessed portion 35c are formed at positions corresponding to the extending directions of the hole portions 33a and 33b respectively. If the positioning pins 34a and 34b are respectively inserted and pressed into the hole portions 33b and 33c, then, similarly to the positioning pin 34c, the end portions of the positioning pins 34a and 34b are inserted into the recessed portions formed on the inner surface 27a of the first groove portion 27.

[0040] <Method for assembling and removing root spring using tool of the present invention (operation of tool)>

[0041] As Figure 1 shown, a method for removing the root spring 10 to be inserted into the gap 6 will be described. Prepare the tools 20 for this method Figure 3 and Figure 4 (preparation step). In the method for removing the root spring 10, a plurality of push rods 40 Figure 7 shown are used. The plurality of push rods 40 includes a front rod 41 and at least one extension rod 42.

[0042] The front rod 41 has a main body portion 41a formed by superposing a substantially rectangular parallelepiped-shaped member and a member having a substantially semicircular cross section in a direction orthogonal to the long side direction. On one end face 41a1 of the main body portion 41a, an insertion portion 41b having the same shape as the main body portion 41a but thinner than the main body portion 41a is provided. On the other end face 41a2 of the main body portion 41a, a cylindrical recess 41c is formed. The extension rod 42 has a cylindrical main body portion 42a. On one end face 42a1 of the main body portion 42a, an insertion portion 42b having the same cylindrical shape as the main body portion 42a but thinner than the main body portion 42a is provided. On the other end face 42a2 of the main body portion 42a, a cylindrical recess 42c is formed.

[0043] The insertion portion 41b of the front rod 41 can be inserted into the space 14 of the root spring 10. When the insertion portion 41b is inserted into the space 14, the end face 41a1 of the main body portion 41a of the front rod 41 contacts the end portion 10a of the root spring 10. The insertion portion 42b of the extension rod 42 can be inserted into the recess 41c of the front rod 41. When the insertion portion 42b is inserted into the recess 41c, the end face 41a2 of the main body portion 41a of the front rod 41 contacts the end face 42a1 of the main body portion 42a of the extension rod 42. In addition, the insertion portion 42b of another extension rod 42 can be inserted into the recess 42c of the extension rod 42. When the insertion portion 42b of another extension rod 42 is inserted into the recess 42c of one extension rod 42, the end face 42a2 of the main body portion 42a of one extension rod 42 contacts the end face 42a1 of the main body portion 42a of the other extension rod 42.

[0044] After the preparation step, the tool 20 (refer to Figure 3 and 4 ) is installed on the rotor 2 (refer to Figure 1 )(installation step). The state of installing the tool 20 on the rotor 2 is shown in Figure 8 . A sealing arm 50 protruding along the axial direction of the rotor 2 is provided on the rotor 2, and a protrusion 51 projects from the sealing arm 50 toward the radially outer side of the rotor 2 (in Figure 8extends downward. The protrusion 51 also extends in the circumferential direction of the rotor 2 (in the Figure 8 direction perpendicular to the paper surface in the Figure 8 ). It is depicted as the downward direction being vertically downward in the

[0045] , but the self-weight bearing surface 28d contacts the upper surface 50a of the seal arm 50 facing upward. The protrusion 51 is inserted into the first groove portion 27.

[0046] On the other hand, as Figure 9 shown, the tool 20 rotates in the direction of arrow C with the side surface 22c of the substrate 22 facing upward. In this way, the bottom surface 27b, which is a part of the inner surface 27a of the first groove portion 27, faces upward and abuts against the protrusion 51. Thereby, the rotation of the tool 20 stops, and the tool 20 is installed on the rotor 2. It should be noted that the rotation of the tool 20 can also be stopped by the inner surface 27a of the first groove portion 27 other than the bottom surface 27b facing upward and abutting against the protrusion 51.

[0047] It should be noted that in the tool 20, the first groove portion 27 is located at a position in the direction in which the piston portion 32 pushes the push rod 40 closer to the hydraulic jack 21. Therefore, the tool 20 can be installed close to the rotor 2 for removing the blade root spring 10. Thus, even in a narrow working place, the efficiency of the operation for removing the blade root spring 10 can be improved.

[0048] As Figure 10 shown, a plurality of locking key grooves 52 are formed at the edge of the protrusion 51, and a groove 53 is located on the extension line of the gap 6 (refer to Figure 1 ). When one of the plurality of positioning pins 34a, 34b, 34c, for example, the positioning pin 34b, is set on the substrate 22 and the positioning pin 34b is inserted into any one of the plurality of locking key grooves 52, any one of the grooves 53 coincides with the second groove portion 31. Therefore, the gap 6 is located on the extension line of the second groove portion 31. Such a positioning step can be performed between the preparation step and the installation step. Thereby, the installation position of the tool 20 in the circumferential direction of the rotor 2 can be easily determined. It should be noted that which positioning pin is used in the positioning of the tool 20 depends on the positional relationship between the locking key grooves 52 and the groove 53 formed at the edge of the protrusion 51, in other words, the structure of the rotating machine including the moving blade 1 and the rotor 2.

[0049] After the installation step, the hydraulic jack 21 ( Figure 3 and 4 ) pushes the push rod 40 (refer to Figure 1 ) toward the root spring 10 inserted into the gap 6 (refer to Figure 7 )(pushing step). As Figure 11 shown, the front rod 41 is placed on the second groove portion 31 (refer to Figure 3 ) from the lower surface 22a side of the substrate 22 through the hole 23. When the hydraulic jack 21 is driven to extend the piston portion 32 (refer to Figure 3 ), the front rod 41 is pressed by the piston portion 32 and is pushed toward the root spring 10 inserted into the gap 6 through the second groove portion 31.

[0050] In this way, as Figure 7 shown, the insertion portion 41b of the front rod 41 is inserted into the space 14 of the root spring 10, and the end face 41a1 of the main body portion 41a of the front rod 41 presses the end portion 10a of the root spring 10. As a result, the root spring 10 moves within the gap 6 (refer to Figure 1 ). At least a part of the front rod 41 is inserted into the gap 6.

[0051] Next, after the piston portion 32 is contracted, as Figure 11 shown, the extension rod 42 is placed on the second groove portion 31 (refer to Figure 3 ) from the lower surface 22a side of the substrate 22 through the hole 23. When the hydraulic jack 21 is driven to extend the piston portion 32 (refer to Figure 3 ), the extension rod 42 is pressed by the piston portion 32 and is pushed toward the root spring 10 inserted into the gap 6 through the second groove portion 31.

[0052] In this way, as Figure 7 shown, the insertion portion 42b of the extension rod 42 is inserted into the recess 41c of the front rod 41, and the end face 42a1 of the main body portion 42a of the extension rod 42 presses the end face 41a2a of the main body portion 41a of the front rod 41. As a result, the root spring 10 moves further within the gap 6 (refer to Figure 1 ). The front rod 41 is further inserted into the gap 6, and at least a part of the extension rod 42 is inserted into the gap 6.

[0053] After that, by repeatedly pushing the extension rod 42 toward the root spring 10, the root spring 10 gradually moves within the gap 6 (refer to Figure 1 ), and finally, as Figure 12 shown, the root spring 10 is taken out from the gap 6. After the root spring 10 is taken out, the taking-out operation of the root spring 10 ends by taking out the push rod 40 in the gap 6.

[0054] In addition, when the piston portion 32 presses the blade root spring 10 by pushing the front end rod 41 or the extension rod 42, the reaction force is applied to the tool 20. Refer to Figure 11 , as described above, the tool 20 is mounted on the rotor 2 by the engagement of the self-weight bearing portion 28 and the sealing arm 50 and the engagement of the first groove portion 27 and the protrusion portion 51. The front end rod 41 or the extension rod 42 is pushed by the piston portion 32 toward the end portion 22c, so that the above reaction force is applied to the tool 20 toward the opposite end portion 22d. In response to this, the protrusion portion 51 is inserted into the first groove portion 27, so that even if the tool 20 moves in the direction of the end portion 22d due to the reaction force, the movement stops because the protrusion portion 51 abuts against the inner surface 27a of the first groove portion 27. That is, the inner surface 27a of the first groove portion 27 bears the reaction force.

[0055] In this way, in a state where the tool 20 is mounted on the rotor 2, the protrusion portion 51 included in the rotor 2 is inserted into the first groove portion 27, so that the reaction force when the piston portion 32 pushes the push rod 40 toward the blade root spring 10 to take out the blade root spring 10 can be borne by the abutment of the protrusion portion 51 against the inner surface 27a of the first groove portion 27. Thereby, the blade root spring 10 can be reliably taken out. In addition, the push rod 40 is pushed toward the blade root spring 10 by the piston portion 32 to take out the blade root spring 10, so that the efficiency of the operation of taking out the blade root spring 10 can be improved.

[0056] So far, the method of taking out the blade root spring 10 has been described, but the method of assembling the blade root spring 10 is substantially the same as the method of taking out the blade root spring 10. The blade root spring 10 is longer than the push rod 40, so one end of the blade root spring 10 is inserted into the gap 6, and the other end of the blade root spring 10 is struck with a hammer or the like to insert the blade root spring 10 into the gap 6 as much as possible.

[0057] Next, the preparation step and the installation step are carried out in the same manner as when the method of taking out the blade root spring 10 is performed. In the installation step, the blade root spring 10 partially inserted into the gap 6 is fitted into the second groove portion 31. Then, the blade root spring 10 is pushed by the piston portion 32 (pushing step), so that the blade root spring 10 is inserted and assembled into the gap 6. At this time, if necessary, the blade root spring 10 may be pushed via the push rod 40.

[0058] In the case of assembling the blade root spring 10, when the piston portion 32 pushes the blade root spring 10, the reaction force is also applied to the tool 20. This reaction force can also be borne by the abutment of the protrusion portion 51 against the inner surface 27a of the first groove portion 27 in the same manner as when the method of taking out the blade root spring 10 is performed. In addition, by pushing the blade root spring 10 by the piston portion 32 to assemble the blade root spring 10, the efficiency of the operation of assembling the blade root spring 10 can be improved.

[0059] The content described in each of the above embodiments can be understood as follows, for example.

[0060] [1] The tool for assembling and removing the blade root spring according to one aspect is a tool for assembling and removing the blade root spring (10) that fixes the moving blade (1) to the rotor (2). Among them,

[0061] The tool for assembling and removing the blade root spring includes:

[0062] A pushing mechanism (hydraulic jack 21) that pushes the blade root spring (10) or presses a pushing rod (40) pressed against the blade root spring (10); and

[0063] A substrate (22) that fixes the pushing mechanism (21),

[0064] A first groove portion (27) is formed on the substrate (22). The first groove portion (27) is used to bear the reaction force when the pushing rod (40) is pushed toward the blade root spring (10) by the pushing mechanism (21) to push the blade root spring (10) for assembly or removal of the blade root spring (10).

[0065] According to the tool for assembling and removing the blade root spring of the present invention, the pushing rod is pushed toward the blade root spring by the pushing mechanism to push and assemble the blade root spring or remove the blade root spring. Therefore, the efficiency of the operation of assembling and removing the blade root spring can be improved. In addition, when the tool is installed on the rotor, the protrusion included in the rotor is inserted into the first groove portion, so that the reaction force when the pushing mechanism pushes the pushing rod toward the blade root spring to remove the blade root spring or push and assemble the blade root spring can be borne by the contact between the protrusion and the inner surface of the first groove portion.

[0066] [2] The tool according to another aspect is based on the tool in [1].

[0067] The tool (20) further includes a self-weight bearing portion (28). The self-weight bearing portion (28) includes a self-weight bearing surface (28d) for bearing the self-weight of the tool (20).

[0068] The self-weight bearing surface (28d) is located between the first groove portion (27) and the pushing mechanism (21), and extends in a direction intersecting the extending direction of the first groove portion (27) when the self-weight is borne on the self-weight bearing surface (28d).

[0069] According to such a structure, the self-weight bearing surface abuts against the surface of the rotor vertically downward, and the inner surface of the first groove portion abuts against the protrusion vertically upward, so that the tool can be installed on the rotor.

[0070] [3]The tool of another solution is based on the tool of [2],

[0071] The first groove portion (27) has a bottom surface (27b) that is part of the inner surface (27a) of the first groove portion (27).

[0072] According to such a structure, the self-weight bearing surface abuts against the surface of the rotor vertically downward, and the bottom surface, which is part of the inner surface of the first groove portion, abuts against the protrusion vertically upward, so that the tool can be more reliably mounted on the rotor.

[0073] [4]The tool of another solution is based on any one of the tools of [1] to [3],

[0074] The first groove portion (27) is located in a position closer to the direction in which the pushing mechanism (21) pushes the push rod (40) or the blade root spring (10) than the pushing mechanism (21).

[0075] According to such a structure, the tool can be mounted close to the rotor for assembling or removing the blade root spring. Therefore, even in a narrow working space, the efficiency of assembling and removing the blade root spring can be improved.

[0076] [5]The tool of another solution is based on the tool of [4],

[0077] A second groove portion (31) is formed on the substrate (22). The second groove portion (31) is for the push rod (40) or the blade root spring (10) to be inserted when the pushing mechanism (21) pushes the push rod (40) or the blade root spring (10).

[0078] The first groove portion (27) intersects with the second groove portion (31).

[0079] According to such a structure, the tool can be mounted close to the rotor for assembling or removing the blade root spring. Therefore, even in a narrow working space, the efficiency of assembling and removing the blade root spring can be improved.

[0080] [6]The tool of another solution is based on any one of the tools of [1] to [5],

[0081] On the substrate (22), positioning pins (34a, 34b, 34c) are detachably provided in a manner that crosses the first groove portion (27).

[0082] According to such a structure, when the tool is mounted on the rotor, by fitting into any one of the plurality of locking key grooves formed at the edge of the protrusion, the mounting position in the circumferential direction of the rotor can be easily determined.

[0083] [7]A method for assembling and removing a blade root spring is a method for assembling and removing a blade root spring (10) that fixes a moving blade (1) to a rotor (2). Among them,

[0084] The method for assembling and removing the blade root spring includes:

[0085] A preparation step of preparing a tool (20), the tool (20) having a pushing mechanism (hydraulic jack 21) for pushing the blade root spring (10) or pressing on the pushing rod (40) of the blade root spring (10), and a substrate (22) for fixing the pushing mechanism (21);

[0086] An installation step of installing the tool (20) on the rotor (2); and

[0087] A pushing step of the pushing mechanism (21) pushing the pushing rod (40) or the blade root spring (10),

[0088] A first groove portion (27) is formed on the substrate (22), and the first groove portion (27) is configured to be able to insert a protrusion portion (51) included in the rotor (2).

[0089] In the pushing step, by the protrusion portion (51) abutting against the inner surface (27a) of the first groove portion (27), the reaction force when the pushing rod (40) is pushed toward the blade root spring (10) by the pushing mechanism (21) to push the blade root spring (10) for assembly or removal of the blade root spring (10) is borne.

[0090] According to the method for assembling and removing the blade root spring of the present invention, the pushing rod is pushed toward the blade root spring by the pushing mechanism to push and assemble the blade root spring or remove the blade root spring, so that the efficiency of the operation of assembling and removing the blade root spring can be improved. In addition, in a state where the tool is installed on the rotor, the protrusion portion included in the rotor is inserted into the first groove portion, so that the reaction force when the pushing rod is pushed toward the blade root spring by the pushing mechanism to remove the blade root spring or when the blade root spring is pushed and assembled can be borne by the protrusion portion abutting against the inner surface of the first groove portion.

[0091] [8]Based on the method in [7], the method of another solution

[0092] The tool (20) further has a self-weight bearing portion (28), and the self-weight bearing portion (28) includes a self-weight bearing surface (28d) for bearing the self-weight of the tool (20).

[0093] The self-weight bearing surface (28d) is located between the first groove portion (27) and the pushing mechanism (21), and when the self-weight is borne by the self-weight bearing surface (28d), it extends in a direction intersecting the extending direction of the first groove portion (27).

[0094] In the installation step, the self-weight bearing surface (28d) abuts against the surface (50a) of the rotor (2) with the vertical direction facing downward, and the inner surface (27a) of the first groove portion (27) abuts against the protrusion portion (51) with the vertical direction facing upward, thereby installing the tool (20) on the rotor (2).

[0095] According to such a method, the self-weight bearing surface abuts against the surface of the rotor with the vertical direction facing downward, and the inner surface of the first groove portion abuts against the protrusion portion with the vertical direction facing upward, so that the tool can be installed on the rotor.

[0096] [9] The method of another embodiment is based on the method of [8].

[0097] The first groove portion (27) has a bottom surface (27b) that is part of the inner surface (27a).

[0098] In the installation step, the bottom surface (27b) abuts against the protrusion portion (51) with the vertical direction facing upward.

[0099] According to such a method, the self-weight bearing surface abuts against the surface of the rotor with the vertical direction facing downward, and the bottom surface of the first groove portion abuts against the protrusion portion with the vertical direction facing upward, so that the tool can be more reliably installed on the rotor.

[0100]

[10] The method of another embodiment is based on the methods of [7] to [9].

[0101] On the substrate (22), positioning pins (34a, 34b, 34c) are detachably provided in a manner crossing the first groove portion (27).

[0102] A positioning step is further included between the preparation step and the installation step. In this positioning step, the installation position of the substrate (22) in the circumferential direction of the rotor (2) is determined.

[0103] In the positioning step, based on the locking key groove (52) formed on the protrusion portion (51) and the positioning pins (34a, 34b, 34c), the installation position of the substrate (22) in the circumferential direction of the rotor (2) is determined.

[0104] According to such a method, when installing the tool on the rotor, the installation position in the circumferential direction of the rotor can be easily determined.

[0105] Description of the reference numerals:

[0106] 1...Moving blade

[0107] 2...Rotor

[0108] 10...Root spring of blade

[0109] 20...Tool

[0110] 21...Hydraulic jack (pushing mechanism)

[0111] 22...Substrate

[0112] 27...First groove part

[0113] 27a...Inner surface (of the first groove part)

[0114] 27b...Bottom surface (of the first groove part)

[0115] 28...Self-weight bearing part

[0116] 28d...Self-weight bearing surface

[0117] 31...Second groove part

[0118] 34a...Positioning pin

[0119] 34b...Positioning pin

[0120] 34c...Positioning pin

[0121] 40...Pushing rod

[0122] 50a...Surface (of the rotor)

[0123] 51...Protrusion

Claims

1. A tool for assembling and removing a blade root spring, the blade root spring being used to fix a moving blade to a rotor, wherein, the tool for assembling and removing the blade root spring comprises: a pushing mechanism that pushes the blade root spring or a pushing rod pressed against the blade root spring; a substrate that fixes the pushing mechanism; and a mounting portion that is provided on the substrate, a first groove portion is formed on the substrate, and the first groove portion is used to withstand the reaction force when assembling or removing the blade root spring by pushing the pushing rod toward the blade root spring through the pushing mechanism to push the blade root spring, the tool further comprises a self-weight bearing portion, and the self-weight bearing portion includes a self-weight bearing surface for bearing the self-weight of the tool, the self-weight bearing portion can rotate about an axis provided on the mounting portion, the self-weight bearing portion includes an end portion at the position farthest from the axis in the long side direction, and has a shape in which the thickness becomes thinner from a position between the axis and the end portion toward the end portion, the self-weight bearing surface is located between the first groove portion and the pushing mechanism, and extends in a direction intersecting with the extending direction of the first groove portion when the self-weight bearing surface bears the self-weight.

2. The tool for assembling and removing a blade root spring according to claim 1, wherein, the first groove portion has a bottom surface that is a part of the inner surface of the first groove portion.

3. The tool for assembling and removing a blade root spring according to claim 1 or 2, wherein, the first groove portion is located at a position closer to the direction in which the pushing mechanism pushes the pushing rod or the blade root spring than the pushing mechanism.

4. A tool for assembling and removing a blade root spring, the blade root spring being used to fix a moving blade to a rotor, wherein, the tool for assembling and removing the blade root spring comprises: a pushing mechanism that pushes the blade root spring or a pushing rod pressed against the blade root spring; and a substrate that fixes the pushing mechanism, a first groove portion is formed on the substrate, and the first groove portion is used to withstand the reaction force when assembling or removing the blade root spring by pushing the pushing rod toward the blade root spring through the pushing mechanism to push the blade root spring, the first groove portion is located at a position closer to the direction in which the pushing mechanism pushes the pushing rod or the blade root spring than the pushing mechanism, a second groove portion is formed on the substrate, and the second groove portion is for inserting the pushing rod or the blade root spring when the pushing mechanism pushes the pushing rod or the blade root spring, the first groove portion and the second groove portion intersect with each other.

5. A tool for assembling and removing a blade root spring, the blade root spring being used to fix a moving blade to a rotor, wherein, the tool for assembling and removing the blade root spring comprises: a pushing mechanism that pushes the blade root spring or a pushing rod pressed against the blade root spring; and a substrate that fixes the pushing mechanism, a first groove portion is formed on the substrate, and the first groove portion is used to withstand the reaction force when assembling or removing the blade root spring by pushing the pushing rod toward the blade root spring through the pushing mechanism to push the blade root spring, On the substrate, a positioning pin is detachably provided in a manner crossing the first groove portion.

6. A method for assembling and removing a blade root spring, the blade root spring being used to fix a moving blade to a rotor, wherein, the method for assembling and removing the blade root spring includes: a preparation step of preparing a tool, the tool having a pushing mechanism for pushing the blade root spring or pressing on a pushing rod of the blade root spring, a substrate for fixing the pushing mechanism, and a mounting portion provided on the substrate; a mounting step of mounting the tool on the rotor; and a pushing step in which the pushing mechanism pushes the pushing rod or the blade root spring, a first groove portion is formed on the substrate, and the first groove portion is configured to allow a protrusion portion included in the rotor to be inserted therein, in the pushing step, by the protrusion portion abutting against the inner surface of the first groove portion, the reaction force when the pushing rod is pushed toward the blade root spring by the pushing mechanism to push the blade root spring for assembling the blade root spring or removing the blade root spring is borne, the tool further has a self-weight bearing portion, the self-weight bearing portion including a self-weight bearing surface for bearing the self-weight of the tool, the self-weight bearing portion can rotate about an axis provided on the mounting portion, the self-weight bearing portion includes an end portion at a position farthest from the axis in the long side direction, and has a shape in which the thickness becomes thinner from a position between the axis and the end portion toward the end portion, the self-weight bearing surface is located between the first groove portion and the pushing mechanism, and extends in a direction intersecting the extending direction of the first groove portion when the self-weight bearing surface bears the self-weight, in the mounting step, by the self-weight bearing surface vertically abutting against the surface of the rotor downward, and the inner surface of the first groove portion vertically abutting against the protrusion portion upward, the tool is mounted on the rotor.

7. The method for assembling and removing a blade root spring according to claim 6, wherein, the first groove portion has a bottom surface as a part of the inner surface, in the mounting step, the bottom surface vertically abuts against the protrusion portion upward.

8. A method for assembling and removing a blade root spring, the blade root spring being used to fix a moving blade to a rotor, wherein, the method for assembling and removing the blade root spring includes: a preparation step of preparing a tool, the tool having a pushing mechanism for pushing the blade root spring or pressing on a pushing rod of the blade root spring, and a substrate for fixing the pushing mechanism; a mounting step of mounting the tool on the rotor; and a pushing step in which the pushing mechanism pushes the pushing rod or the blade root spring, a first groove portion is formed on the substrate, and the first groove portion is configured to allow a protrusion portion included in the rotor to be inserted therein, in the pushing step, by the protrusion portion abutting against the inner surface of the first groove portion, the reaction force when the pushing rod is pushed toward the blade root spring by the pushing mechanism to push the blade root spring for assembling the blade root spring or removing the blade root spring is borne, On the substrate, a positioning pin is detachably provided in a manner that traverses the first groove portion. A positioning step is further included between the preparation step and the installation step. In the positioning step, the installation position of the substrate in the circumferential direction of the rotor is determined. In the positioning step, based on the locking key groove formed in the protrusion portion and the positioning pin, the installation position of the substrate in the circumferential direction of the rotor is determined.

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