JP5323146B2 - Lifting jig - Google Patents

Description

The present invention is to provide Agekasane the member center of gravity is deviated, such a steam turbine diaphragm, relates lifting duty jig to enable you to prevent tilting of the member.

  Generally, a steam turbine includes a plurality of moving blades attached to a rotor, and a stationary blade that is provided between the moving blades and changes the flow of steam so that steam is efficiently applied to the moving blades. Each of these stationary blades is connected to a diaphragm, and is fixed by a casing in a state where the stationary blades are connected (see, for example, Patent Document 1). When such a steam turbine is opened and inspected, conventionally, the casing is removed, a shackle is attached to the diaphragm, the suspension is lifted by one-point suspension, and disassembled for inspection.

JP 2006-183486 A

  As described above, when the shackle is attached to the diaphragm and is lifted by one-point suspension, the center of gravity is not located directly below the position where the shackle is attached. Therefore, when the shackle is lifted, the diaphragm tilts from the vertical direction. As a result, the rotor blades and adjacent diaphragms may come into contact with each other, which may cause damage or destruction.

  The present invention has been made in view of the above problems, and an object of the present invention is to enable lifting of a member having a biased center of gravity such as a diaphragm without tilting.

In order to achieve the above object, the present invention is a lifting jig that is used by being connected to the top of the lifting target member when lifting the lifting target member with a rope extending from the lifting device,
A plate-like member formed with an attachment portion of the wire;
A rod-shaped member provided with an attachment portion of the rope at the upper end, connectable to the top of the member to be lifted, and provided so as to penetrate the plate-shaped member;
The mounting portion of the rod-shaped member and the mounting portion of the plate-shaped member are configured to be arranged at positions sandwiching the center of gravity of the lifting target member in plan view.

  According to the present invention, even if the position of the center of gravity of the lifting target member is biased, the lifting target member is prevented from being inclined because it is lifted at two points on a straight line passing through the center of gravity.

It is an axial sectional view showing the state where the casing of the steam turbine was removed. It is an enlarged view of a diaphragm. It is a figure which shows a shackle. It is a figure which shows a mode that the diaphragm is lifted by one point suspension. It is a figure which shows the jig | tool for lifting, (A) is a top view, (B) is a side view. It is a figure which shows a mode that it lifts using the jig | tool for lifting.

Hereinafter, an embodiment of a lifting jig according to the present invention will be described in detail with reference to the drawings. In the following description, a case where the diaphragm of the steam turbine is lifted using the lifting jig of the present embodiment will be described as an example.

  FIG. 1 is an axial sectional view showing a state where a casing of the steam turbine 1 is removed. Since the diaphragm has a shape that is substantially symmetric with respect to the central axis, FIG. 1 shows a portion above the central axis. FIG. 2 is an enlarged view of the diaphragm 13.

  As shown in FIG. 1, the steam turbine 1 is positioned between a rotor 10, a plurality of moving blades 11 attached to the outer periphery of the rotor 10 at appropriate intervals in the axial direction, and adjacent moving blades 11. The stationary vane 12 provided as described above, a diaphragm 13 to which the stationary vane 12 is attached, and a casing (not shown) that holds the diaphragm 13 are configured.

The direction of flow of the steam that has flowed into the steam turbine 1 is changed by the stationary blade 11 so that the steam is efficiently applied to the moving blade 12, and the rotor 10 is rotated by the steam having the changed flow direction hitting the moving blade 12. To do.

  The diaphragm 13 is a ring-shaped member divided in the vertical direction, and is arranged so as to be aligned in the axial direction. Separating plates 14 and 15 that are in contact with the rotor 10 and the casing are attached to the inner peripheral side and the outer peripheral side of the diaphragm 13, respectively. The diaphragm 14 on the outer peripheral side of each diaphragm 13 is provided with a radial seal portion 14A so as to be in contact with the end portion of the adjacent moving blade 11, and the radial seal portion 14A comes into contact with the moving blade 11 to Leakage can be prevented. Further, each diaphragm 13 has a shackle 20 shown in FIG. 3 (a bar-like shape having an opening at the top and screwed on the outer peripheral surface so that it can be lifted by a lifting device such as a crane during open inspection. A mounting hole in which a thread is formed is provided at the top for mounting a member.

  As described in the prior art section, when such a steam turbine 1 is opened and inspected, the casing 10 is removed, the diaphragm 13 is lifted and disassembled, and then the rotor 10 is inspected. Conventionally, as shown in FIG. 4, when lifting the diaphragm 13, it is attached by screwing the shackle 20 into a mounting hole provided in the outer side separation plate 14 of the diaphragm 13, and a crane or the like is attached to the shackle 20. The diaphragm 13 was lifted by connecting a chain 22 or the like extending from the center. However, since the diaphragm 13 is provided with the radial seal portion 14 </ b> A so as to protrude in the axial direction, the center of gravity of the diaphragm 13 is biased toward the radial seal portion 14 </ b> A and is not directly below the shackle 20. For this reason, when the shackle 20 is lifted, the center of gravity is inclined from the vertical direction so that the center of gravity is directly below the shackle 20. If the diaphragm 13 is tilted in this way, it may collide with the adjacent diaphragm 13 or the moving blade 11 to be damaged. The lifting method of the present embodiment is characterized in that the diaphragm 13 can be prevented from tilting even when the center of gravity is not located directly below the mounting position of the shackle 20 as described above.

  5A and 5B are diagrams showing the lifting jig 30 of the present embodiment, in which FIG. 5A is a plan view and FIG. 5B is a side view. FIG. 6 is a schematic diagram showing a state where the lifting jig 30 is attached to the diaphragm 13. As shown in FIG. 5, the lifting jig 30 of the present embodiment includes a through hole 30 </ b> B having a diameter substantially equal to that of the shackle 20 and an annularly projecting hook 30 </ b> A that can connect a chain or the like extending from the crane. It consists of the formed plate-shaped member.

  As shown in FIG. 5, the lifting jig 30 of this embodiment is attached by inserting the shackle 20 into the through hole 30 </ b> B and then screwing the shackle 20 into the attachment hole of the diaphragm 13. Since the diameter of the through hole 30 </ b> B is substantially equal to the diameter of the shackle 20, the lifting jig 30 is fixed to the shackle 20. At this time, the hook 30 </ b> A of the lifting jig 30 and the hook 20 </ b> A of the shackle 20 are attached so as to sandwich the center of gravity of the diaphragm 13 in plan view.

  When lifting is performed, a chain block 21 or the like is attached to a chain 22 extending from a lifting device such as a crane in advance, and the chain 22 is branched. Then, one of the branched chains 22A is connected to the hook 20A of the shackle 20, and the other chain 22B is connected to the hook 30A of the lifting jig 30. Then, the length of the chain 22B on the side connected to the hook 30A of the lifting jig 30 is adjusted by the chain block 21 so that there is no slack in the chain 22B on the side connected to the hook 30A of the lifting jig 30. To do.

  Thus, after adjusting the length of the chain 22B on the side connected to the hook 30A of the lifting jig 30 by the chain block 21, the chain 22 is pulled up by the lifting device. Thus, by using the lifting jig 30 of the present embodiment, the diaphragm 13 can be lifted at two points: the shackle 20 and the hook 30 </ b> A of the lifting jig 30. At this time, since the positions of the shackle 20 and the hooks 20A, 30A of the lifting jig 30 are located so as to sandwich the center of gravity position of the diaphragm 13 in plan view, the diaphragm 13 can be prevented from being inclined more than the vertical direction.

  As described above, since the diaphragm 13 can be lifted in a state where the posture is maintained by using the lifting jig 30 of the present embodiment, the lifted diaphragm 13 comes into contact with other diaphragms 13 and the moving blades 11. , Can prevent damage.

  In this embodiment, a plate-like member in which the through hole 30B and the hook 30A are formed is used as the lifting jig. However, the present invention is not limited to this, and the jig can be fixed to the diaphragm 13 in plan view. In this case, a jig that can be lifted by a member such as a chain at two points on a straight line passing through the center of gravity of the diaphragm 13 may be used.

  Moreover, although this embodiment demonstrated the case where a diaphragm is lifted, it is not restricted to this, It is a rod-shaped or plate-shaped member, the gravity center position is biased, and there exists a possibility that it may incline in one point hanging. The lifting method of the present invention can be applied when lifting a long member such that its longitudinal direction or in-plane direction is substantially vertical.

  In the present embodiment, the shackle is inserted and fixed in the through hole of the lifting jig. However, the present invention is not limited to this, and the lifting jig and the shackle may be formed as an integrated jig. .

DESCRIPTION OF SYMBOLS 1 Steam turbine 10 Rotor 11 Rotor blade 12 Stator blade 13 Diaphragm 14,15 Separation plate 14A Radial seal part 20 Shackle 20A Hook 21 Chain block 22, 22A, 22B Chain 30 Lifting jig 30A Hook 30B Through-hole

Claims (4)

When lifting a lifting target member with a rope extending from a lifting device, a lifting jig used connected to the top of the lifting target member,
A plate-like member formed with an attachment portion of the wire;
A rod-shaped member provided with an attachment portion of the rope at the upper end, connectable to the top of the member to be lifted, and provided so as to penetrate the plate-shaped member;
The mounting portion of the bar-shaped member and the mounting portion of the plate-shaped member are configured to be arranged at positions sandwiching the center of gravity of the lifting target member in plan view. Lifting jig.   2. The lifting jig according to claim 1, wherein the plate-like member includes a through-hole through which the rod-like member is inserted, and the rod-like member is inserted through the through-hole.   The lifting jig according to claim 1, wherein the plate-like member and the rod-like member are integrally formed.   The lifting jig according to any one of claims 1 to 3, wherein the lifting target member is a diaphragm of a turbine.

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