Lifting device for single stator base

Abstract

The invention discloses a single stator frame lifting device, and belongs to the technical field of hydro-generator transformation. The problems that the overall structure of the stator frame is damaged and the stator frame cannot be reused in the prior art are solved. According to the technical scheme, a plurality of lifting pieces are welded to an arc-shaped lifting bearing disc, a lifting steel rope penetrates through the lifting pieces, a lifting machine is connected with the lifting steel rope, a lifting screw penetrates through the arc-shaped lifting bearing disc and a single-valve stator base, the top of the lifting screw is fixed to the arc-shaped lifting bearing disc, and the bottom of the lifting screw is fixed to a lower ring of the single-valve stator base. Aiming at the situation that a water-turbine generator set is transformed, the height of a factory building is limited, and overall hoisting of a stator frame cannot be achieved, detachable installation of a hoisting tool of a non-welding structure is achieved, hoisting operation can be rapidly conducted on the multi-petal stator frame, and the installation efficiency is improved; the hoisting device is simple in structure, stable in structure, uniform in stress, capable of being expanded to be suitable for hoisting single-petal stator machine bases of other sizes, flexible in structure and wide in engineering application and popularization value.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator retrofitting technology, specifically to a single-lobed stator base lifting device. Background Technology

[0002] In the 1960s and 70s, domestically produced and imported hydro-generator units gradually exceeded their lifespan limits, leading to frequent shutdowns for maintenance. The effective operating time of the units decreased, and maintenance costs increased. Power plants in China with such problems began to carry out complete unit upgrades. The upgrade plans often involved increasing the motor capacity. Due to the increased size of the main components of the unit and the limitations of the original plant design in terms of lifting height, it was impossible to use integral stator lifting tools with excessive axial height dimensions. It was also impossible to weld and assemble the stator frame in the installation room, stack the stator sector laminations, and lay them down.

[0003] Existing stator frame lifting techniques typically involve simply binding the structure with wire ropes, which is not conducive to safe on-site modification and construction. Alternatively, welding lifting lugs onto the structure requires removing the lugs after lifting, and the welding and removal processes release heat, damaging the structure and making efficient reuse impossible.

[0004] Therefore, there is an urgent need to propose a single-lobe stator frame lifting device to solve the problems of damage to the overall structure of the stator frame and the inability to reuse it in the existing technology. Summary of the Invention

[0005] In view of the above facts, in order to solve the problems of damage to the overall structure of the stator frame and inability to be reused in the prior art, the present invention designs a single-lobed stator frame lifting device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A single-lobed stator base lifting device includes an arc-shaped lifting support plate, a lifting steel cable, and a lifting screw.

[0008] Several lifting rods are welded onto the arc-shaped lifting support plate. The lifting steel cable passes through the lifting rods, and the crane is connected to the lifting steel cable. The lifting screw passes through the arc-shaped lifting support plate and the single-lobed stator base. The top of the lifting screw is fixed to the arc-shaped lifting support plate, and the bottom of the lifting screw is fixed to the lower ring of the single-lobed stator base.

[0009] Furthermore, the suspension system includes end suspension systems and middle suspension systems.

[0010] Furthermore, a welding bevel is provided around the bottom of the hoist.

[0011] Furthermore, the hanging bracket has a round hole in the middle, and the corners around the round hole are rounded.

[0012] Furthermore, the arc-shaped lifting support plate is provided with through holes.

[0013] Furthermore: the lifting screw passes through the upper ring of the single-lobed stator base, the lifting steel pipe of the single-lobed stator base, and the lower ring;

[0014] The top of the lifting screw is fixed to the arc-shaped lifting support plate by a top nut and a first thick washer;

[0015] The bottom of the lifting screw is fixed to the lower ring by a bottom nut and a second thick washer.

[0016] Furthermore, the top and bottom of the lifting screw are provided with threaded sections of equal length.

[0017] Furthermore, lifting screw holes are machined at the center of both ends of the lifting screw.

[0018] Furthermore, the diameter of the smooth section in the middle of the lifting screw is smaller than the inner wall size of the lifting steel pipe, leaving a safety margin for verticality.

[0019] Furthermore: the top ring of the single-lobe stator base is provided with a groove, and the arc-shaped lifting support plate is provided with an axially downward boss corresponding to the groove. The axial dimension of the boss is greater than the axial dimension of the groove. An axial safety gap is left between the arc-shaped lifting support plate and the top ring. The circumferential dimension of the boss is smaller than the circumferential dimension of the groove. A circumferential safety gap is left between the arc-shaped lifting support plate and the top ring.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This invention addresses the situation where the stator frame cannot be lifted as a whole due to the limited height of the plant building during the retrofitting of hydro-generator sets. It enables the detachable installation of non-welded lifting tools, allowing for rapid lifting of multi-lobed stator frames and improving installation efficiency.

[0022] 2. This invention concentrates the lifting stress point on the lifting tool, protecting the single-lobe stator base from harmful deformation during lifting, improving installation quality, and effectively ensuring the installation foundation of other structural components.

[0023] 3. The present invention sets up a lifting screw to optimize the lifting force of the single-lobed stator base, improve the eccentricity and tilting problems of the single-lobed stator base, and make the single-lobed stator base maintain a stable posture during lifting, translation and falling into the pit.

[0024] 4. The present invention has a stable structure, uniform stress distribution, and can be extended to lift single-lobed stator bases of other sizes. It can be modularly designed, with adjustable inner and outer diameters of the arc-shaped lifting support plate, adjustable number and distribution of lifting rods, and adjustable length of lifting screws. The structure is flexible and has wide engineering application and promotion value. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the present invention;

[0026] Figure 2 This is a diagram showing the positional relationship between the arc-shaped lifting support plate and the lifting rod of the present invention;

[0027] Figure 3 This is a diagram showing the positional relationship between the arc-shaped lifting support plate and the top ring of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the hanging device of the present invention.

[0029] In the diagram: 1-Arc-shaped lifting support plate, 2-End lifting rod, 3-Middle lifting rod, 4-Lifting steel cable, 5-Lifting screw, 6-Top nut, 7-Bottom nut, 8-First thick washer, 9-Second thick washer, 10-Lifting steel pipe, 11-Through hole, 12-Groove, 13-Boss, 14-Axial safety clearance, 15-Circumferential safety clearance, 16-Threaded section, 17-Lifting screw hole, 18-Smooth rod section, 19-Vertical safety margin, 20-Welding bevel, 21-Round hole, 22-Rounded corner. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0031] The terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0034] Example: A single-lobe stator base lifting device according to this example includes an arc-shaped lifting support plate 1, a lifting steel cable 4, and a lifting screw 5;

[0035] Several lifting rods are welded onto the arc-shaped lifting support plate 1. The lifting steel cable 4 passes through the lifting rods. The crane is connected to the lifting steel cable 4. The lifting screw 5 passes through the arc-shaped lifting support plate 1 and the single-lobed stator base. The top of the lifting screw 5 is fixed to the arc-shaped lifting support plate 1, and the bottom of the lifting screw 5 is fixed to the lower ring of the single-lobed stator base.

[0036] More specifically: the suspension climber includes an end suspension climber 2 and a middle suspension climber 3.

[0037] More specifically: Welding bevels 20 are provided around the bottom of the hoist to ensure a firm weld.

[0038] More specifically: the hoisting rod has a round hole 21 in the middle, and the round hole 21 is rounded around the corners 22 to protect the hoisting steel cable 4.

[0039] More specifically: the arc-shaped lifting support plate 1 is provided with a through hole 11 to facilitate the passage of the lifting screw 5.

[0040] More specifically: the lifting screw 5 passes through the upper ring of the single-lobed stator base, the lifting steel pipe 10 of the single-lobed stator base, and the lower ring.

[0041] More specifically: the top of the lifting screw 5 is fixed to the arc-shaped lifting support plate 1 by the top nut 6 and the first thick washer 8;

[0042] The bottom of the lifting screw 5 is fixed to the lower ring by the bottom nut 7 and the second thick washer 9.

[0043] More specifically: the top nut 6 and the bottom nut 7 are hexagonal nuts.

[0044] More specifically: the lifting screw 5 has threaded sections 16 of equal length at both the top and bottom, is universal on both sides, and can be used in reverse.

[0045] More specifically: the lifting screw 5 has lifting screw holes 17 machined at both ends of its center, which can lift the lifting screw 5 independently.

[0046] More specifically: the diameter of the smooth rod section 18 in the middle of the lifting screw 5 is smaller than the inner wall size of the lifting steel pipe 10. Considering the verticality deviation of the lifting steel pipe 10 itself and the deformation during the welding process, a verticality safety margin 19 is reserved.

[0047] More specifically: the top ring of the single-lobe stator base is provided with a groove 12, and the arc-shaped lifting support plate 1 is provided with an axially downward boss 13 corresponding to the groove 12. The axial dimension of the boss 13 is greater than the axial dimension of the groove 12. An axial safety gap 14 is left between the arc-shaped lifting support plate 1 and the top ring. The circumferential dimension of the boss 13 is smaller than the circumferential dimension of the groove 12. A circumferential safety gap 15 is left between the arc-shaped lifting support plate 1 and the top ring.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; as long as there is no structural conflict, the various features in the specific embodiments disclosed in this application can be combined with each other in any way, and will not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A single-lobed stator base lifting device, characterized in that, Includes an arc-shaped lifting support plate (1), lifting steel cable (4), lifting screw (5); Several lifting rods are welded on the arc-shaped lifting support plate (1). The lifting steel cable (4) passes through the lifting rods. The crane is connected to the lifting steel cable (4). The lifting screw (5) passes through the arc-shaped lifting support plate (1) and the single-petal stator base. The top of the lifting screw (5) is fixed to the arc-shaped lifting support plate (1), and the bottom of the lifting screw (5) is fixed to the lower ring of the single-petal stator base.

2. The single-lobe stator base lifting device according to claim 1, characterized in that, The suspension system includes an end suspension system (2) and a middle suspension system (3).

3. The single-lobe stator base lifting device according to claim 2, characterized in that, The bottom of the hoist is provided with a welding bevel (20) around its perimeter.

4. A single-lobe stator base lifting device according to claim 3, characterized in that, The hanging rod has a round hole (21) in the middle, and the round hole (21) is rounded around the corner (22).

5. A single-lobe stator base lifting device according to claim 1, characterized in that, The arc-shaped lifting support plate (1) is provided with a through hole (11).

6. A single-lobe stator base lifting device according to claim 1, characterized in that, The lifting screw (5) passes through the upper ring of the single-lobed stator base, the lifting steel pipe (10) of the single-lobed stator base, and the lower ring; The top of the lifting screw (5) is fixed to the arc-shaped lifting support plate (1) by the top nut (6) and the first thick washer (8); The bottom of the lifting screw (5) is fixed to the lower ring by the bottom nut (7) and the second thick washer (9).

7. A single-lobe stator base lifting device according to claim 1, characterized in that, The top and bottom of the lifting screw (5) are provided with threaded sections (16) of equal length.

8. A single-lobe stator base lifting device according to claim 1, characterized in that, The lifting screw (5) has lifting screw holes (17) machined at both ends.

9. A single-lobe stator base lifting device according to claim 1, characterized in that, The diameter of the smooth rod section (18) in the middle of the lifting screw (5) is smaller than the inner wall size of the lifting steel pipe (10), leaving a safety margin (19) for verticality.

10. A single-lobe stator base lifting device according to claim 1, characterized in that, The top ring of the single-lobe stator base is provided with a groove (12), and the arc-shaped lifting support plate (1) is provided with an axially downward boss (13) corresponding to the groove (12). The axial dimension of the boss (13) is greater than the axial dimension of the groove (12). An axial safety gap (14) is left between the arc-shaped lifting support plate (1) and the top ring. The circumferential dimension of the boss (13) is smaller than the circumferential dimension of the groove (12). A circumferential safety gap (15) is left between the arc-shaped lifting support plate (1) and the top ring.

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