Lifting equipment and lifting method

Abstract

A lifting tool according to the present disclosure is for lifting a gas turbine blade provided with a shroud at a leading end thereof, and comprises: a holding part which has a pair of holding pieces extending in the vertical direction and rotatably connected to each other and which constitutes a cross-link mechanism for opening and closing lower ends and upper ends of the holding pieces; and a pair of lifting parts which are provided to the lower ends of the pair of holding pieces. The lifting parts each comprises: a first member which protrudes from the lower end of the corresponding holding piece in the closing direction of the lower end and which has a supporting surface capable of supporting a bottom surface of the shroud from below; and a second member which protrudes in the closing direction above the first member, by a protrusion length shorter than that of the first member, and which has an abutment surface capable of abutting against a lateral surface of the shroud.

Description

Technical Field

[0001] The present disclosure relates to a lifting tool and a lifting method. This application claims priority to Japanese Patent Application No. 2022-125213, filed on Aug. 5, 2022, the contents of which are incorporated herein by reference.

Background Art

[0002] For example, Patent Document 1 discloses a technique in which a suspension jig (lifting tool) is attached to both ends of an arc-shaped inner shroud, and a hook of a hoisting device such as a crane is hooked to a shackle to lift the inner shroud together with the suspension jig.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when attaching a gas turbine blade to a rotor shaft of a turbine, the gas turbine blade may be lifted in the blade height direction using a lifting tool. In this case, for example, when the blade root on the lower end side of the gas turbine blade is inserted into a groove formed in the rotor shaft, the state in which the gas turbine blade is lifted by the lifting tool is release maintained, and most of the load of the gas turbine blade may be applied to the groove.

[0005] Therefore, with the load of the gas turbine blade applied to the groove, the entire blade root is inserted into the groove while adjusting the orientation and position of the blade root, and a large amount of force and time may be required for the attachment work of the gas turbine blade. That is, there is a problem that it is difficult to smoothly attach the gas turbine blade to the rotor shaft.

[0006] This disclosure was made to solve the above-mentioned problems and aims to provide a lifting device and a lifting method that can smoothly attach gas turbine blades to the rotor shaft. [Means for solving the problem]

[0007] To solve the above problems, the lifting device according to the present disclosure is a lifting device for a gas turbine blade having a shroud at its tip, and comprises a gripping portion having a pair of gripping pieces that extend vertically and are rotatably connected to each other, and the lower ends and upper ends of the pair of gripping pieces form a cross-link mechanism that opens and closes, respectively, and a pair of lifting portions provided at the lower ends of the pair of gripping pieces, each of which comprises a first member that protrudes from the lower end of the gripping piece in the closing direction of the lower end and has a support surface capable of supporting the lower surface of the shroud from below, and a second member that is above the first member and protrudes in the closing direction with a shorter protrusion length than the first member and has a contact surface capable of contacting the side surface of the shroud, A substrate is fixed to the lower end of the gripping portion, positioned so that its thickness direction aligns with the closing direction, and protruding in the vertical direction and in directions intersecting the closing direction, to have Furthermore, the side surface of the shroud is the surface facing the axial direction of the rotor shaft when the gas turbine blades are attached to the rotor shaft, the opening and closing direction of the lower end is aligned with the axial direction of the rotor shaft, the first member protrudes from the base plate in the closing direction and is provided in multiple locations spaced apart in the intersecting directions, and by rotating the gripping portion from a state in which the contact surface of the second member is in contact with the side surface of the shroud to an open direction opposite to the closing direction, the shroud can be supported by the first member. .

[0008] The lifting method according to the present disclosure is a lifting method for lifting a gas turbine blade having a shroud at its tip using a lifting device, wherein the lifting device has a pair of gripping pieces that extend vertically and are rotatably connected to each other, and the lower ends and upper ends of the pair of gripping pieces form a cross-link mechanism that opens and closes, and a pair of lifting parts provided at the lower ends of the pair of gripping pieces, each of which has a first member that protrudes from the lower end of the gripping piece in the closing direction of the lower end and has a support surface capable of supporting the lower surface of the shroud from below, and a second member that is above the first member and protrudes in the closing direction with a shorter protrusion length than the first member and has a contact surface capable of contacting the side surface of the shroud, A substrate is fixed to the lower end of the gripping portion, positioned so that its thickness direction aligns with the closing direction, and protruding in the vertical direction and in directions intersecting the closing direction, It has, The side surface of the shroud is the surface that faces the axial direction of the rotor shaft when the gas turbine blade is attached to the rotor shaft, the opening and closing direction of the lower end is aligned with the axial direction of the rotor shaft, and the first member protrudes from the base plate in the closing direction and is provided in multiple locations spaced apart in the intersecting directions.The closing direction is set to a direction that sandwiches the side of the shroud facing upstream and the side facing downstream, the first member supports the lower surface of the shroud, and the second member abuts against the side of the shroud in a wing gripping step, and the lifting step lifts the lifting device upward, The shroud can be supported by the first member by rotating the gripping portion from a state in which the contact surface of the second member is in contact with the side surface of the shroud, so that it opens in the opposite direction to the closing direction. . [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a lifting device and a lifting method that enable smooth attachment of gas turbine blades to the rotor shaft. [Brief explanation of the drawing]

[0010] [Figure 1] These are a front view (a) and a side view (b) for illustrating the configuration of a lifting device according to the embodiment of the present disclosure, where the side view (b) is a view from the direction of line BB in the front view (a). [Figure 2] This figure illustrates how the amount of rotation of a pair of gripping pieces is restricted by the locking mechanism according to the embodiment of this disclosure. [Figure 3] This is a flowchart showing a wing mounting method according to an embodiment of the present disclosure. [Figure 4] This is a diagram illustrating the wing attachment process according to the embodiments of this disclosure. [Figure 5] This is a diagram illustrating the configuration of a gas turbine blade according to an embodiment of the present disclosure. [Modes for carrying out the invention]

[0011] The following describes the configuration for implementing the lifting device and lifting method according to this disclosure, with reference to the attached drawings.

[0012] [Lifting equipment] The lifting tool in this embodiment is a tool for lifting a gas turbine blade. The lifting tool is used for assembly during the manufacture of a turbine in a gas turbine, disassembly and reassembly during maintenance of the turbine, and the like. During assembly in the manufacture of the turbine, while maintaining the state in which the gas turbine blade is lifted using this lifting tool, the gas turbine blade is attached to the rotor shaft of the turbine.

[0013] Here, the configuration of the gas turbine blade to be lifted by the lifting tool will be described. As shown in FIG. 5, a plurality of gas turbine blades 100 are attached to the disk of the rotor shaft 200 of a turbine (the illustration of the overall configuration is omitted). The rotor shaft 200 has a columnar shape extending in the direction in which the axis Ar extends, and is a rotating shaft that can rotate around the axis Ar. The plurality of attached gas turbine blades 100 are arranged at equal intervals in the circumferential direction of the rotor shaft 200.

[0014] Hereinafter, for convenience of explanation, the direction in which the axis Ar extending with the rotor shaft 200 as the center of rotation extends is referred to as the "axial direction Da", the circumferential direction with respect to this axis Ar is simply referred to as the "circumferential direction Dc", and the direction perpendicular to the axis Ar is referred to as the "radial direction". Also, of both sides in the axial direction Da, one side is referred to as the "axial upstream side Dau", and the opposite side is referred to as the "axial downstream side Dad".

[0015] In this embodiment, the axial upstream side Dau is the side where the combustion gas generated by the combustor (not shown) of the gas turbine flows, and the axial downstream side Dad is the side where the combustion gas flows away.

[0016] (Gas turbine blade) The gas turbine blade 100 is a moving blade that is arranged in a plurality in the circumferential direction Dc by being attached to the rotor shaft 200. Hereinafter, for convenience of explanation, this gas turbine blade 100 is referred to as the "moving blade 100". By arranging a plurality of moving blades 100 on the rotor shaft 200 in the circumferential direction Dc, these plurality of moving blades 100 form a blade row (blade group). The moving blade 100 has a blade body 101, a platform 102, a shaft mounting portion 103, and a shroud 104.

[0017] (Blade body) The blade body 101 has a cross-section that forms an airfoil and extends in a direction perpendicular to this cross-section. Hereinafter, for convenience of explanation, this direction is referred to as the "blade height direction Dwh". In the state where the moving blade 100 is fixed to the rotor shaft 200, the blade height direction Dwh coincides with the radial direction of the rotor shaft 200. Here, the side of the rotor shaft 200 with respect to the blade body 101 in the blade height direction Dwh is referred to as the "hub side Dwhs", and the opposite side is referred to as the "tip side Dwht".

[0018] The blade body 101 has a leading edge 101a and a trailing edge 101b, and a ventral surface 101c and a dorsal surface 101d that connect the leading edge 101a and the trailing edge 101b and face opposite sides.

[0019] The leading edge 101a is the edge on the most upstream side Dau in the moving blade 100 in the state where the moving blade 100 is fixed to the rotor shaft 200. The trailing edge 101b is the edge on the most downstream side Dad in the moving blade 100 in the state where the moving blade 100 is fixed to the rotor shaft 200. The ventral surface 101c is a positive pressure surface that is curved in a concave shape. The dorsal surface 101d is a negative pressure surface that is curved in a convex shape toward the side where the ventral surface 101c is recessed and faces the side opposite to the ventral surface 101c.

[0020] (Platform) The platform 102 is a pedestal that supports the blade body 101. The platform 102 is provided at the end of the hub side Dwhs of the blade body 101. The platform 102 is a plate-like member that extends in a direction having a component perpendicular to the blade height direction Dwh from the end of the hub side Dwhs of the blade body 101. Note that a gas path surface 102a that faces the tip side Dwht and contacts the combustion gas is formed on the platform 102.

[0021] (Shaft mounting portion) The shaft mounting portion 103 fixes the platform 102 to the rotor shaft 200. The shaft mounting portion 103 has a shank 103a extending from the platform 102 in the blade height direction Dwh away from the blade body 101, and a blade root 103b extending from the shank 103a in the blade height direction Dwh away from the blade body 101. The cross-sectional shape of the blade root 103b is Christmas tree-shaped. This blade root 103b can fit into a blade root groove 201 formed in the rotor shaft 200.

[0022] (Shroud) The shroud 104 is provided at the tip-side Dwht end of the blade body 101. Therefore, the shroud 104 is provided at the tip (tip-side Dwht) of the gas turbine blade 100. The shroud 104 extends from the blade body 101 in a direction perpendicular to the radial direction. Each shroud 104 increases the overall rigidity of the blade row by contacting adjacent shrouds 104 in the circumferential direction Dc when the rotor blades 100 are mounted on the rotor shaft 200 to form a blade row. When the rotor blades 100 are mounted on the rotor shaft 200, the shroud 104 has a side surface 104b facing the upstream side Dau of the axis and a side surface 104b facing the downstream side Dad of the axis. The shroud 104 also has a lower surface 104a facing the hub-side Dwhs.

[0023] Return to the explanation of lifting device 1. As shown in Figure 1, the lifting device 1 in this embodiment includes a gripping part 10, a lifting part 20, a V-shaped link mechanism 30, an external force application part 40, a locking mechanism 60, a handle part 70, a first connecting pin 51, a second connecting pin 52, and a third connecting pin 53.

[0024] (gripping part) The gripping part 10 constitutes the main body of the lifting device 1 and is the part that generates the force for gripping (restraining) the rotor blade 100. The gripping portion 10 has a pair of gripping pieces 11.

[0025] (gripping piece) The pair of gripping pieces 11 extend in the vertical direction Dv (vertical direction in Figure 1). In this embodiment, the vertical direction Dv coincides with the vertical direction. Hereinafter, the upper side in the vertical direction Dv will be simply referred to as "upper side Dvu," and the lower side in the vertical direction Dv will be simply referred to as "lower side Dvd." In this embodiment, the pair of gripping pieces 11 are formed of a material such as metal.

[0026] The pair of gripping pieces 11 overlap each other and are rotatably connected to each other by a first connecting pin 51. The pair of gripping pieces 11 rotate relative to each other around the first connecting pin 51, forming a cross-link mechanism in which the lower ends 11b and upper ends 11a open and close, respectively.

[0027] Therefore, the pair of gripping pieces 11 can rotate in opposite directions. In this embodiment, when each of the pair of gripping pieces 11 rotates in opposite directions, rotation in the direction in which the upper ends 11a and the lower ends 11b move closer to each other is referred to as "closing," and rotation in the direction in which the upper ends 11a and the lower ends 11b move further apart is referred to as "opening."

[0028] Furthermore, the direction in which the upper ends 11a and lower ends 11b of the pair of gripping pieces 11 move apart from each other and move closer together is called the "opening / closing direction Doc". Within this opening / closing direction Doc, the direction in which the upper ends 11a and lower ends 11b of the pair of gripping pieces 11 move closer together (the direction in which the pair of gripping pieces 11 close) is called the "closing direction", and the direction in which the upper ends 11a and lower ends 11b move apart from each other (the direction in which the pair of gripping pieces 11 open) is called the "opening direction".

[0029] In this embodiment, the closing direction is the direction that sandwiches the side surface 104b of the shroud 104 of the rotor blade 100, specifically the side surface 104b facing the upstream side Dau when the rotor blade 100 is attached to the rotor shaft 200, and the side surface 104b facing the downstream side Da. More preferably, the closing direction is made to coincide with the axial direction Da when the rotor blade 100 is attached to the rotor shaft 200.

[0030] (Lifting section) The lifting section 20, in conjunction with the gripping section 10, supports and restrains the rotor blade 100 by clamping it. The lifting section 20 is a pair Gripping piece 11 They are provided at the lower end 11b of each. The lifting section 20 includes a substrate 23, a first member 21, and a second member 22.

[0031] (substrate) The substrate 23 is a flat plate-shaped component. The substrate 23 is fixed to the lower end 11b of the gripping portion 10 by fastening members such as bolts (not shown). The substrate 23 is made of a material such as metal. Gripping piece 11 The substrates 23 fixed to the lower ends 11b of each have opposing surfaces 23a that face each other.

[0032] When the lifting device 1 lifts the rotor blade 100, the pair of opposing surfaces 23a sandwich the side surface 104b of the shroud 104 that faces upstream of the axis Dau and the side surface 104b that faces downstream of the axis Dad.

[0033] Therefore, the pair of substrates 23 are close to each other when the pair of gripping pieces 11 are closed in the closing direction. Also, the pair of substrates 23 are separated from each other when the pair of gripping pieces 11 are opened in the opening direction. In other words, the opposing surfaces 23a of the pair of substrates 23 move apart and closer together as the pair of gripping pieces 11 open and close.

[0034] (First component) The first member 21 is provided on the opposing surface 23a of the substrate 23. The first member 21 is a member that protrudes from the opposing surface 23a of each substrate 23 in the closing direction toward the lower end 11b. That is, the first member 21 is provided on the substrate 23 so as to protrude from the opposing surface 23a toward each other.

[0035] In this embodiment, multiple first members 21 are arranged on the opposing surface 23a. The first members 21 are formed from a synthetic resin material. For example, MC nylon (registered trademark) can be used as the material forming the first members 21 in this embodiment.

[0036] The first member 21 has a planar support surface 21a facing upward Dvu when the pair of gripping pieces 11 are closed in the closing direction. The support surface 21a of the first member 21 faces the lower surface 104a of the shroud 104 in the vertical direction Dv when the pair of opposing surfaces 23a have the shroud 104 in between, and can support this lower surface 104a from downward Dvd.

[0037] (Second component) The second member 22 is provided on the opposing surface 23a of the substrate 23. The second member 22 is positioned above the first member 21 on the Dvu side. In this embodiment, multiple second members 22 are arranged on the opposing surface 23a. The second member 22 is a member that protrudes from the opposing surface 23a of each substrate 23 in the closing direction of the lower end 11b.

[0038] The second member 22 protrudes in the closing direction with a shorter protrusion length than the first member 21. Here, "protrusion length" refers to the length of protrusion from the substrate 23 in the closing direction. The second member 22 is formed of a synthetic resin material. For example, MC nylon (registered trademark) can be used as the material forming the second member 22 in this embodiment.

[0039] The second member 22 has a contact surface 22a that can abut against the side surface 104b of the shroud 104 when the pair of gripping pieces 11 are closed in the closing direction. The contact surface 22a has a convex curved shape that is convex in the closing direction from the opposing surface 23a of the substrate 23.

[0040] Therefore, when the pair of gripping pieces 11 are closed in the closing direction, the support surface 21a of the first member 21 supports the lower surface 104a of the shroud 104 from below, and the contact surface 22a of the second member 22 contacts the side surface 104b of the shroud 104, thereby restraining the rotor blade 100 with the lifting section 20. In other words, the gripping section 10 and the lifting section 20 work in conjunction to lift the rotor blade 100 while gripping it.

[0041] (V-shaped linkage mechanism) The V-shaped link mechanism 30 is a link mechanism for opening and closing the gripping part 10. The V-shaped link mechanism 30 is linked to the gripping part 10. The V-shaped link mechanism 30 has a pair of link pieces 31.

[0042] (Link fragment) The pair of link pieces 31 extend in the vertical direction Dv. The pair of link pieces 31 overlap each other, and their upper ends 31a are rotatably connected to each other by a second connecting pin 52. The lower ends 31b of each of the pair of link pieces 31 are rotatably connected to the upper ends 11a of the corresponding gripping piece 11 by a third connecting pin 53. In this embodiment, the link pieces 31 are made of a material such as metal.

[0043] The lower ends 31b of the pair of link pieces 31 are close to each other when the gripping pieces 11 are closed with respect to their connecting portion, and are separated from each other when the gripping pieces 11 are opened with respect to their connecting portion.

[0044] (External force application section) The external force application section 40 is connected to a second connecting pin 52 that connects the link pieces 31 together, and is a coupling fitting to which a crane wire (not shown) or the like is attached, and which is lifted upward to the Dvu by this wire.

[0045] The external force application unit 40 can lift the rotor blade 100 to the upper Dvu through the V-shaped link mechanism 30, the gripping unit 10, and the lifting unit 20 by being lifted to the upper Dvu. In other words, the external force application unit 40 can lift the rotor blade 100 by applying an external force from outside the lifting device 1 toward the upper Dvu.

[0046] (Locking mechanism) The locking mechanism 60 is a component that can restrict the amount of rotation of the pair of gripping pieces 11 in the closing and opening directions. The locking mechanism 60 is provided so as to span the upper ends 11a of the pair of gripping pieces 11. The locking mechanism 60 is made of a material such as metal. The locking mechanism 60 in this embodiment includes a locking plate 61 and a lever portion 62.

[0047] (Lock plate) The locking plate 61 is provided across a pair of third connecting pins 53. The locking plate 61 is rotatably mounted on one of the pair of third connecting pins 53. In addition, a guide hole 610 is formed on the portion of the locking plate 61 opposite to the portion provided on one of the third connecting pins 53, which can guide the other third connecting pin 53. The other third connecting pin 53 is positioned inside this guide hole 610.

[0048] In this embodiment, the guide hole 610 is composed of a first housing hole 611 and a second housing hole 612 that are spaced apart from each other and can accommodate the other third connecting pin 53 in a state of receiving it, and a connecting hole 613 that connects the first housing hole 611 and the second housing hole 612.

[0049] The first housing hole 611 and the second housing hole 612 are located above the connecting hole 613, on the upper side Dvu. The connecting hole 613 extends in one direction across the first housing hole 611 and the second housing hole 612, on the lower side Dvd. The guide hole 610, consisting of the first housing hole 611, the second housing hole 612, and the connecting hole 613, forms a U shape when viewed from the front. In this embodiment, the one direction coincides with the opening and closing direction Doc of the pair of gripping pieces 11.

[0050] (Lever part) The lever portion 62 is provided on the lock plate 61 in an integral state with the lock plate 61 and is operated by the operator using the lifting device 1. In this embodiment, the lever portion 62 extends in one direction from the end of the lock plate 61 on the side of the other third connecting pin 53.

[0051] The operation of the locking mechanism 60 in restricting (locking) the amount of rotation of the pair of gripping pieces 11 when the lever portion 62 is operated by the operator's hand will be explained below with reference to Figure 2.

[0052] When the other third connecting pin 53 is positioned in the first housing hole 611 in the guide hole 610 (upper left (a) in Figure 2), and the lever portion 62 is pushed upward Dvu, the other third connecting pin 53 is positioned at the closing end within the connection hole 613 (upper right (b) in Figure 2). Next, as the pair of gripping pieces 11 rotate in the opening direction, the other third connecting pin 53 is guided in one direction (opening direction) by the connection hole 613 (lower left (c) in Figure 2). Then, when the lever portion 62 is pushed down, the other third connecting pin 53 is positioned within the second housing hole 612 (lower right (d) in Figure 2).

[0053] Through the above series of operations, the guide hole 610 rotates (opens and closes) the pair of gripping pieces 11 by the length of the connecting hole 613, The other third connecting pin 53 The pair of gripping pieces 11 can be stopped from rotating further in the opening direction by being received by the second housing hole 612.

[0054] Furthermore, when the other third connecting pin 53 is positioned in the second housing hole 612 in the guide hole 610 (lower right (d) in Figure 2), and the lever portion 62 is pushed upward Dvu, the other third connecting pin 53 is positioned at the end on the opening side within the connection hole 613 (lower left (c) in Figure 2). Next, as the pair of gripping pieces 11 rotate in the closing direction, the other third connecting pin 53 is guided by the connection hole 613 in the opposite direction to the above one direction (closing direction) (upper right (b) in Figure 2). Next, when the lever portion 62 is pushed down, the other third connecting pin 53 is positioned within the first housing hole 611 (upper left (a) in Figure 2).

[0055] Through the above series of operations, the guide hole 610 rotates (opens and closes) the pair of gripping pieces 11 by the length of the connecting hole 613, The other third connecting pin 53 The pair of gripping pieces 11 can be stopped from rotating further in the closing direction by being received by the first housing hole 611.

[0056] Therefore, the lever portion 62 can be used to shift the position of the other third connecting pin 53 within the guide hole 610, thereby restricting the amount of rotation of the pair of gripping pieces 11 in the opening / closing direction Doc.

[0057] For the sake of explanation, the state of the locking mechanism 60 when the other third connecting pin 53 is positioned in the first housing hole 611 will be referred to as the "closed state," and the state of the locking mechanism 60 when the other third connecting pin 53 is positioned in the second housing hole 612 will be referred to as the "open state."

[0058] (Handle part) As shown in Figure 1, the handle portion 70 is provided on one of the pair of gripping pieces 11, and is a part that can be operated by the hand of the worker using the lifting device 1 to move the entire lifting device 1.

[0059] Furthermore, when the other third connecting pin 53 is positioned in the connection hole 613 of the guide hole 610, the handle portion 70 can be pushed up or down in the vertical direction Dv by the operator's hand, thereby adjusting the rotation of the pair of gripping pieces 11 in the opening and closing direction Doc. The handle portion 70 is positioned Dvd below the first connecting pin 51 to which the pair of gripping pieces 11 are connected.

[0060] In this embodiment, the handle portion 70 has an upper horizontal bar 71, a lower horizontal bar 72, and a vertical bar 73. The upper horizontal bar 71 extends in one direction (opening direction) from the gripping piece 11 in the direction in which the lever portion 62 extends. The lower horizontal bar 72 is positioned below the upper horizontal bar 71, at a distance Dv. The lower horizontal bar 72 extends from the gripping piece 11 in the same direction as described above. The vertical bar 73 is the part that is gripped by the operator's hand and connects the upper horizontal bar 71 and the lower horizontal bar 72 in the vertical direction Dv.

[0061] [Wing attachment method] Next, the wing attachment method in this embodiment will be described with reference to Figure 3. This wing attachment method involves performing a wing gripping step S1, a wing lifting step S2, and a wing attachment step S3. In this embodiment, the lifting method for the rotor blade 100 is realized by performing the wing gripping step S1 and the wing lifting step S2.

[0062] (wing gripping process) The blade gripping process S1 is the process of gripping the rotor blade 100 with the lifting device 1. First, in the blade gripping process S1, the locking mechanism 60 is opened. Next, the closing direction of the pair of gripping pieces 11 on the lifting device 1 is set so that they clamp the side surface 104b of the shroud 104, specifically the side surface 104b facing the upstream side Dau of the axis when the rotor blade 100 is attached to the rotor shaft 200, and the side surface 104b facing the downstream side Dad of the axis. At this time, the operator moves the entire lifting device 1 by handling the handle portion 70. Alternatively, the rotor blade 100 itself may be moved towards the lifting device 1.

[0063] In other words, the entire lifting device 1 is moved so that the shroud 104 of the rotor blade 100 is sandwiched between the pair of lifting parts 20. Next, the lever part 62 is pushed upward Dvu and the pair of gripping pieces 11 are rotated in the closing direction, and the lever part 62 is pushed downward Dvd to close the locking mechanism 60. As a result, the support surface 21a of the first member 21 supports the lower surface 104a of the shroud 104, and the contact surface 22a of the second member 22 contacts the side surface 104b of the shroud 104.

[0064] (Wing lifting process) The wing lifting process S2 is performed after the wing gripping process S1 and lifts the rotor blade 100 to the upper Dvu. In the wing lifting process S2, an external force directed towards the upper Dvu is applied to the external force application unit 40, thereby lifting the rotor blade 100 to the upper Dvu. Specifically, a crane wire or the like is attached to the external force application unit 40, and this wire lifts the external force application unit 40 to the upper Dvu, thereby lifting the rotor blade 100 to the upper Dvu together with the lifting device 1.

[0065] (Wing attachment process) The blade mounting process S3 is performed after the blade lifting process S2, and involves attaching the rotor blade 100 to the turbine rotor shaft 200. Specifically, as shown in Figure 4, with the rotor blade 100 lifted by the lifting device 1, the blade root 103b of the shaft mounting portion 103 of the rotor blade 100 is inserted into the blade root groove 201 formed in the rotor shaft 200 from the axial direction Da.

[0066] In this case, the lifting device 1 allows the rotor blade 100 to be lifted, that is, the blade root 103b to be lifted off the inner surface of the blade root groove 201, and the blade root 103b can be inserted into the blade root groove 201. In this embodiment, insertion is performed from the upstream side Dau of the axis along the direction in which the blade root groove 201 extends. After the insertion of the blade root 103b into the blade root groove 201 is complete, the lifting device 1 is removed from the rotor blade 100.

[0067] By performing the steps described above, the rotor blade 100 is lifted by the lifting device 1 and attached to the rotor shaft 200.

[0068] (Effects and Benefits) In the above configuration, when the rotor blade 100 is lifted by the lifting device 1, the shroud 104 of the rotor blade 100 is supported from below by the support surface 21a of the first member 21 of each lifting section 20, and the shroud 104 of the rotor blade 100 is sandwiched by the contact surface 22a of the second member 22 of each lifting section 20. As a result, when inserting the blade root 103b of the rotor blade 100 into the blade root groove 201, the entire load of the rotor blade 100 is not borne by the blade root groove 201, compared to when the lifted state of the rotor blade 100 is released. In other words, when inserting the blade root 103b of the rotor blade 100 into the blade root groove 201 of the rotor shaft 200, it is possible to suppress the load of the rotor blade 100 being applied to the blade root groove 201. Therefore, the rotor blade 100 can be smoothly attached to the rotor shaft 200.

[0069] Furthermore, since the protruding length of the second member 22 is shorter than the protruding length of the first member 21, for example, by rotating the gripping portion 10 to open in the opposite direction to the closing direction, the shroud 104 of the rotor blade 100 can be supported only by the first member 21. This allows for more precise adjustment of the position and orientation of the rotor blade 100 while maintaining the state in which the rotor blade 100 is supported by the first member 21.

[0070] Furthermore, in the above configuration, the upper ends 11a of each of the pair of gripping pieces 11 of the gripping section 10 are connected to the lower ends 31b of each of the pair of link pieces 31 of the V-shaped link mechanism 30, and the external force application section 40 is connected to the mutually connected upper ends 31a of this pair of link pieces 31. As a result, when the rotor blade 100 is lifted by an external force acting on the external force application section 40, the weight of the lifting device 1 and the load of the rotor blade 100 act downward on the Dvd side, so that a force that rotates the pair of link pieces 31 in the closing direction is continuously applied to the V-shaped link mechanism 30. In other words, a tightening force in the closing direction is continuously applied to the pair of link pieces 31. That is, when the rotor blade 100 is lifted, the upper ends 31a of the pair of link pieces 31 connected to the external force application section 40 become tightened. Therefore, the rotor blade 100 can be gripped more firmly by the second members 22 of the pair of lifting sections 20.

[0071] Furthermore, according to the above configuration, A pair of gripping pieces 11 of the gripping section 10 The opening / closing direction Doc and the axial direction Da of the lower end 11b are aligned. Therefore, for example, when attaching the rotor blade 100 to the rotor shaft 200, interference of the lifting device 1 with adjacent rotor blades 100 already attached to the rotor shaft 200 can be suppressed. Thus, the rotor blades 100 can be attached to the rotor shaft 200 more smoothly.

[0072] Furthermore, with the above configuration, the amount of rotation of the pair of gripping pieces 11 is restricted by the locking mechanism 60, so that the movement of the lifting section 20 in the vertical direction Dv due to the rotation of the pair of gripping pieces 11 can be restricted. Therefore, when attaching the rotor blade 100 to the rotor shaft 200, the load applied from the rotor blade 100 to the blade root groove 201 can be further suppressed. In addition, because the amount of rotation of the pair of gripping pieces 11 is restricted, the movement of the lifting section 20 in the closing direction is restricted, so that the clamping force of the pair of second members 22 does not become excessive on the shroud 104 can be suppressed.

[0073] Furthermore, in the above configuration, the rotation of the pair of gripping pieces 11 can be adjusted by pushing the handle portion 70 up or down in the vertical direction Dv, thereby allowing for high-precision adjustment of the position of the rotor blade 100 in the vertical direction Dv.

[0074] Furthermore, in the above configuration, the first member 21 and the second member 22 of the lifting section 20 are made of synthetic resin material. Therefore, compared to, for example, the case in which these first member 21 and the second member 22 are made of metal material, it is possible to suppress damage to the shroud 104 from the support surface 21a of the first member 21 and the contact surface 22a of the second member 22 when the lifting device 1 lifts the rotor blade 100.

[0075] Furthermore, in the above configuration, the opposing surfaces 23a of the base plate 23 of the lifting portion 20 provided at each of the lower ends 11b of the pair of gripping pieces 11 are parallel to the direction in which the side surface 104b of the shroud 104 facing upstream Dau and the side surface 104b facing downstream Dad of the axis widen. This makes it possible to freely arrange the multiple first members 21 and multiple second members 22 of the lifting portion 20 on this opposing surface 23a. Therefore, depending on the shape of the shroud 104, the shroud 104 can be supported in a balanced manner on the support surface 21a of the first member 21, and the contact surface 22a of the second member 22 can be brought into contact with the appropriate location on the side surface 104b of the shroud 104.

[0076] (Other embodiments) Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to that of the embodiments, and additions, omissions, substitutions, and other modifications to the configuration are possible without departing from the gist of this disclosure.

[0077] The lifting device 1 described in the above embodiment does not necessarily have to be equipped with a locking mechanism 60.

[0078] Furthermore, the handle portion 70 described in the above embodiment may be provided on both of the pair of gripping pieces 11.

[0079] Furthermore, the contact surface 22a of the second member 22 described in the above embodiment may be spherical, for example.

[0080] Furthermore, although the above embodiment describes a case where the first member 21 and the second member 22 are formed from a synthetic resin material, the invention is not limited to this. Instead of the entire first member 21 and the second member 22 being formed from a synthetic resin material, for example, only the parts (surface layers) that constitute the support surface 21a of the first member 21 and the contact surface 22a of the second member 22, that is, a part of the first member 21 and a part of the second member 22, may be formed from a synthetic resin material.

[0081] Furthermore, the gas turbine blade 100 and the lifting device 1 described in the above embodiment can be used as a set. That is, the gas turbine blade 100 and the lifting device 1 may be implemented as a set.

[0082] <Note> The lifting device and lifting method described in the embodiment can be understood, for example, as follows.

[0083] (1) The lifting device 1 according to the first embodiment is a lifting device 1 for a gas turbine blade 100 having a shroud 104 at its tip, and has a pair of gripping pieces 11 that extend in the vertical direction Dv and are rotatably connected to each other, and a gripping part 10 that forms a cross-link mechanism in which the lower ends 11b and upper ends 11a of the pair of gripping pieces 11 open and close, and a pair of lifting parts 20 provided on the lower ends 11b of the pair of gripping pieces 11, Each lifting portion 20 includes a first member 21 that protrudes from the lower end 11b of the gripping piece 11 in the closing direction of the lower end 11b and has a support surface 21a capable of supporting the lower surface 104a of the shroud 104 from below, and a second member 22 that is above the first member 21 and protrudes in the closing direction with a shorter protrusion length than the first member 21 and has a contact surface 22a capable of contacting the side surface 104b of the shroud 104.

[0084] As a result, when the rotor blade 100 is lifted by the lifting device 1, the lower surface 104a of the shroud 104 of the rotor blade 100 is supported from below by the support surface 21a of the first member 21 of each lifting section 20, and the side surface 104b of the shroud 104 of the rotor blade 100 is sandwiched by the contact surface 22a of the second member 22 of each lifting section 20. In other words, the rotor blade 100 is supported by the first member 21 and restrained by the second member 22. Therefore, the rotor blade 100 is suspended more stably, for example, when inserting the gas turbine blade 100 into the groove of the rotor shaft 200, the entire load of the gas turbine blade 100 is not borne by the groove.

[0085] (2) The lifting device 1 according to the second embodiment is the lifting device 1 of (1), further comprising a V-shaped link mechanism 30 consisting of a pair of link pieces 31 whose upper ends 31a are rotatably connected to each other and whose respective lower ends 31b are rotatably connected to the upper end 11a of the corresponding gripping piece 11, and an external force application part 40 provided on the upper end 31a of the V-shaped link mechanism 30.

[0086] As a result, when the gas turbine blade 100 is lifted by an external force acting on the external force application section 40, the weight of the lifting device 1 and the load of the rotor blade 100 act downward on the Dvd side, so that a force that rotates the pair of link pieces 31 in the closing direction continues to be applied to the V-shaped link mechanism 30.

[0087] (3) The lifting device 1 according to the third embodiment is the lifting device 1 of (1) or (2), wherein the closing direction is the side surface 104b of the shroud 104 that faces the upstream side and side 104b facing downstream It is also acceptable to sandwich it in that direction.

[0088] This makes it possible to prevent the lifting device 1 from interfering with the shroud 104 of an adjacent gas turbine blade 100 that is already attached to the rotor shaft 200 when, for example, attaching a gas turbine blade 100 to the rotor shaft 200.

[0089] (4) The lifting device 1 according to the fourth embodiment is the lifting device 1 according to (2), and may further include a locking mechanism 60 that is provided so as to span the upper ends 11a of the pair of gripping pieces 11 and is capable of restricting the amount of rotation of the pair of gripping pieces 11 in the closing direction and the opening direction opposite to the closing direction.

[0090] This makes it possible to restrict the vertical movement Dv of the lifting section 20 that occurs when the pair of gripping pieces 11 rotate.

[0091] (5) The lifting device 1 according to the fifth embodiment is the lifting device 1 of (4), further comprising a pair of connecting pins that connect the upper ends 11a of a pair of gripping pieces 11 and the lower ends 31b of a pair of link pieces 31, the locking mechanism 60 having a locking plate 61 rotatably provided on one of the pair of connecting pins and having a guide hole 610 formed therein that can guide the other connecting pin, and a lever portion 62 extending from the other connecting pin side of the locking plate 61, the guide holes 610 being spaced apart from each other The device may also have a first housing hole 611 and a second housing hole 612 that can accommodate one of the connecting pins in a received state, and a connecting hole 613 that can guide the other connecting pin from the first housing hole 611 to the second housing hole 612, or from the second housing hole 612 to the first housing hole 611, when the lever portion 62 is pushed up to the upper side Dvu and the pair of gripping pieces 11 are rotated in the closing or opening direction, with the other connecting pin positioned in the first housing hole 611 or the second housing hole 612.

[0092] This allows the locking mechanism 60 to be implemented with a more specific configuration.

[0093] (6) The lifting device 1 according to the sixth embodiment is any of the lifting device 1 from (1) to (5), and may further include a handle portion 70 provided below the portion where the pair of gripping pieces 11 are connected, and which can adjust the rotation of the pair of gripping pieces 11 by being pushed up or down in the vertical direction Dv.

[0094] This allows the rotation of the pair of gripping pieces 11 to be adjusted. Therefore, the position of the gas turbine blade 100 in the vertical direction Dv can be adjusted with high precision.

[0095] (7) The lifting device 1 according to the seventh embodiment is any of the lifting devices 1 from (1) to (6), wherein the first member 21 and the second member 22 may be made of a synthetic resin material.

[0096] This makes it possible to suppress damage to the shroud 104 from the first member 21 and the second member 22 when the lifting device 1 lifts the rotor blade 100, compared to, for example, the case where the first member 21 and the second member 22 are made of a metal material.

[0097] (8) The eighth aspect of the lifting method is a lifting method for lifting a gas turbine blade 100 having a shroud 104 at its tip using a lifting device 1, wherein the lifting device 1 has a pair of gripping pieces 11 that extend in the vertical direction Dv and are rotatably connected to each other, and comprises a gripping portion 10 that forms a cross-link mechanism in which the lower ends 11b and upper ends 11a of the pair of gripping pieces 11 open and close, and a pair of lifting portions 20 provided on the lower ends 11b of the pair of gripping pieces 11, each lifting portion 20 that protrudes from the lower end 11b of the gripping piece 11 in the closing direction of the lower end 11b and is capable of supporting the lower surface 104a of the shroud 104 from below The device comprises a first member 21 having a gripping surface 21a, and a second member 22 that is above the first member 21, has a shorter projection length than the first member 21, protrudes in the closing direction, and has a contact surface 22a that can contact the side surface 104b of the shroud 104. The closing direction is set to sandwich the upstream side 104b and the downstream side 104b of the shroud 104, and the first member 21 supports the lower surface 104a of the shroud 104, and the second member 22 is brought into contact with the side surface 104b of the shroud 104 to perform a wing gripping step S1, and the lifting device 1 is lifted to the upper side Dvu to perform a wing lifting step S2. [Explanation of Symbols]

[0098] 1…Lifting equipment 10...Gripping part 11...Gripping piece 11a, 31a...Top end 11b, 31b…lower end 20... Lifting section 21…First component 21a...support surface 22...Second component 22a...Abutment surface 23... Circuit board 23a... Opposite side 30...V-shaped linkage mechanism 31... Link fragment 40... External force application section 51…First connecting pin 52…Second connecting pin 53...Third connecting pin 60... Locking mechanism 61... Lock plate 62...Lever part 70...Handle part 71... Upper horizontal bar 72...Lower horizontal bar 73... vertical bar 100... Gas turbine blades 101...wing body 101a...leading edge 101b… Trailing edge 101c…Ventral aspect 101d…Dorsal side 102…Platform 102a...Gas path surface 103... Shaft mounting section 103a... Shank 103b...wing root 104... Shroud 104a…Bottom surface 104b…side 200... Rotor shaft 201...Flade root groove 610... Guide hole 611...First containment port 612...Second containment port 613…Connection port Ar…Axis line Da…Axis direction Dad... downstream of the axis Dau…Axis upstream side Dc…Circumferential direction Doc…Opening / closing direction Dwh...Wing height direction Dwhs...hub side Dwht…chip side Dv…Vertical direction DVD...lower side Dvu…Upper side S1…wing gripping process S2…wing-mounted engineering S3...wing payment project

Claims

1. A lifting device for gas turbine blades, which has a shroud at its tip, A gripping section having a pair of gripping pieces that extend vertically and are rotatably connected to each other, and the lower ends and upper ends of the pair of gripping pieces form a cross-link mechanism that opens and closes, A pair of lifting parts are provided at the lower ends of the pair of gripping pieces, Equipped with, Each of the aforementioned lifting sections is A first member having a support surface that protrudes from the lower end of the gripping piece in the closing direction of the lower end and is capable of supporting the lower surface of the shroud from below, A second member that is above the first member and protrudes in the closing direction with a shorter protrusion length than the first member, and has a contact surface that can abut against the side surface of the shroud, A substrate is fixed to the lower end of the gripping portion, arranged so that its thickness direction aligns with the closing direction, and protruding in the vertical direction and in directions intersecting the closing direction, It has, The side surface of the shroud is the surface that faces the axial direction of the rotor shaft when the gas turbine blade is attached to the rotor shaft. The opening and closing direction of the lower end is aligned with the axial direction of the rotor shaft. The first member is provided in multiple locations, protruding from the substrate in the closing direction and spaced apart in the intersecting direction. A lifting device in which the shroud can be supported by the first member by rotating the gripping portion from a state in which the contact surface of the second member is in contact with the side surface of the shroud to a state in which the shroud is supported by the first member, so as to open in the opposite direction to the closing direction.

2. A V-shaped link mechanism consisting of a pair of link pieces, the upper ends of which are rotatably connected to each other, and the lower ends of which are rotatably connected to the upper end of the corresponding gripping piece, An external force application part provided at the upper end of the V-shaped link mechanism, The lifting device according to claim 1, further comprising the following:

3. The lifting device according to claim 1 or 2, wherein the closing direction is the direction that sandwiches the side of the shroud that faces upstream and the side that faces downstream.

4. The lifting device according to claim 2, further comprising a locking mechanism provided so as to span the upper ends of a pair of gripping pieces, and capable of restricting the amount of rotation of the pair of gripping pieces in the closing direction and the opening direction opposite to the closing direction.

5. The device further comprises a pair of connecting pins that connect the upper ends of the pair of gripping pieces to the lower ends of the pair of link pieces, The locking mechanism is A locking plate is rotatably provided on one of the pair of connecting pins, and has a guide hole formed therein that can guide the other connecting pin, A lever portion extending from the other connecting pin side of the lock plate, It has, The aforementioned guide hole is A first housing hole and a second housing hole are arranged spaced apart from each other and capable of housing the other connecting pin in a state where it is receiving the other, When the lever portion is pushed upward and the pair of gripping pieces are rotated in the closing or opening direction while the other connecting pin is positioned in the first housing hole or the second housing hole, a connecting hole is provided that can guide the other connecting pin from the first housing hole to the second housing hole, or from the second housing hole to the first housing hole. A lifting device according to claim 4, having the following:

6. The lifting device according to claim 1 or 2, further comprising a handle portion provided below the portion to which the pair of gripping pieces are connected, and capable of adjusting the rotation of the pair of gripping pieces by being pushed up or down in the vertical direction.

7. The lifting device according to claim 1 or 2, wherein the first member and the second member are formed of a synthetic resin material.

8. A lifting method for lifting a gas turbine blade, which has a shroud at its tip, using a lifting device, The aforementioned lifting device is, A gripping section having a pair of gripping pieces that extend vertically and are rotatably connected to each other, and the lower ends and upper ends of the pair of gripping pieces form a cross-link mechanism that opens and closes, A pair of lifting parts are provided at the lower ends of the pair of gripping pieces, Equipped with, Each of the aforementioned lifting sections is A first member having a support surface that protrudes from the lower end of the gripping piece in the closing direction of the lower end and is capable of supporting the lower surface of the shroud from below, A second member that is above the first member and protrudes in the closing direction with a shorter protrusion length than the first member, and has a contact surface that can abut against the side surface of the shroud, A substrate is fixed to the lower end of the gripping portion, arranged so that its thickness direction aligns with the closing direction, and protruding in the vertical direction and in directions intersecting the closing direction, It has, The side surface of the shroud is the surface that faces the axial direction of the rotor shaft when the gas turbine blade is attached to the rotor shaft. The opening and closing direction of the lower end is aligned with the axial direction of the rotor shaft. The first member is provided in multiple locations, protruding from the substrate in the closing direction and spaced apart in the intersecting direction. The closing direction is set to a direction that sandwiches the side of the shroud facing upstream and the side facing downstream, the first member supports the lower surface of the shroud, and the second member abuts against the side of the shroud in a wing gripping step, This includes a wing lifting step of lifting the aforementioned lifting device upwards, A lifting method in which the shroud can be supported by the first member by rotating the gripping portion from a state in which the contact surface of the second member is in contact with the side surface of the shroud to a state in which the shroud is supported by the first member, so as to open in the opposite direction to the closing direction.

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