A method for lifting and installing a quarter-petal stator of a hydro-generator

Abstract

The present invention relates to the technical field of hydro-generator equipment, and in particular to a method for lifting and installing a quarter-lobed stator of a hydro-generator. The lifting method comprises: determining the positions of the main lifting point and the auxiliary lifting point for each lifting based on the position of the center of gravity, including: d The value of s is used to determine whether the supporting round steel in the vents on the back of the quarter-segment stator, near the stator joint plate, has the required main lifting points. If so, auxiliary lifting points are installed on the supporting round steel in the central vents of the quarter-segment stator. If not, a mounting frame is installed, the bottom of which is connected to at least two sets of sleeves on the stator base via support arms and screws. Auxiliary and main lifting points are set on the mounting frame, and a lifting device is installed to achieve lifting and posture adjustment. This lifting and installation method, through the provision of two sets of main and auxiliary lifting points, allows quarter-segment stators with different center of gravity positions to be lifted in a vertical position.

Description

Technical Field

[0001] The present invention relates to the technical field of hydro-generator equipment, and in particular to a method for lifting and installing a quarter-lobe stator of a hydro-generator. Background Art

[0002] For large-capacity, large-diameter hydro-turbine generators, the stators are typically laminated and rolled off the assembly line at the construction site. However, due to installation constraints or production cycle times on some projects, the stators are typically laminated at the manufacturer, then transported to the power plant site, where they are assembled into a circle and the stator coils are installed at the stator joints. For large-capacity, large-diameter hydro-turbine generators that require in-plant lamination, the stators are separated into four sections due to transportation and plant lifting capacity limitations. After the four-section stator is assembled into a circle, twelve fixed support blocks are evenly distributed around the bottom of the stator. Each quarter-section has three fixed support blocks at its base. Due to its large size, the curvature of each stator section is small, and its center of gravity is biased toward the core. Therefore, a single quarter-section stator placed in its natural state on the fixed support blocks would tip over. For generators with conventional capacity and smaller diameter, the stator can be divided into two parts. There are four fixed piers at the bottom of each stator. It will not fall over in a naturally upright state. The lifting point is easier to set and the lifting is less restricted by the structure. Even if it is slightly tilted during lifting, it can be directly separated and assembled.

[0003] The lifting of a stator with four lobes is much more difficult than that of a stator with two lobes. The lifting points are difficult to set, and a quarter-lobed stator is more likely to tip over when lifted. In addition, the lifting of the first quarter-lobed stator to be disassembled and the last quarter-lobed stator to be installed are restricted on both sides of the three-quarter-lobed stator.

[0004] Conventional lifting techniques utilize multiple wire ropes to lift the quarter-lobed stator, with the lifting point located on the back of the stator frame. However, for heavier quarter-lobed stators, wire rope lifting can lead to uneven force distribution and deformation, as the primary load-bearing wire ropes pull the stator at an angle. Furthermore, even when lifting using a combination of wire ropes and support beams, poor wire rope length control or inaccurate calculation of the quarter-lobed stator's center of gravity can cause the stator to tilt after lifting. Once tilted, adjusting the stator's position is extremely difficult.

[0005] During the factory disassembly of a full-circle stator core, the first quarter-segment stator core must be hoisted out. During this process, it is crucial to ensure that the quarter-segment stator core is in a vertical position to prevent it from tilting and damaging adjacent stator cores. When the quarter-segment stator cores (including wire rods) are assembled on site, especially when the last stator core (including wire rods) is hoisted, it is also crucial to ensure that the quarter-segment stator core (including wire rods) is in a vertical position.

[0006] When using conventional hoisting methods, it's difficult to ensure the stator is vertical after lifting. Furthermore, the center of gravity of a quarter-segment stator with and without wire rods varies. Using the same set of wire ropes for lifting, it's impossible to guarantee that each quarter-segment stator with a different center of gravity will remain vertical after lifting.

[0007] In addition, the conventional lifting method is usually to weld a lifting lug on the stator frame and use the lifting lug to achieve the lifting operation. However, for the quarter-lobe stator, it needs to be suspended as a whole to withstand a large gravity during the lifting process, and the outer wall of the stator frame is relatively thin, and there is no structural condition for directly welding the lifting lug. Since the lifting lug needs to bear a large load, a large tensile stress and obvious stress concentration will be generated at the connection between the lifting lug and the stator frame, which can easily exceed the allowable stress range of the material, resulting in deformation of the stator frame ring plate or even structural damage. In addition, the lifting lug welding workload is large, and it is necessary to use angle grinder grinding or carbon arc gouging to remove it later. Not only is the construction process cumbersome and labor-intensive, but it is also easy to damage the stator frame body during the removal process. At the same time, welding slag splashes may also cause pollution or damage to key components such as the stator core and wire rods, posing a high quality and safety risk. Summary of the Invention

[0008] To address the aforementioned technical issues, the present invention proposes a method for hoisting and installing a quarter-lobed stator for a hydro-turbine generator. By providing two sets of main and auxiliary lifting points, this method accommodates the hoisting of quarter-lobed stators with varying center of gravity positions, fully utilizing the stator frame structure without damaging it. The coordination of these lifting points and the lifting fixture ensures uniform force distribution during hoisting, facilitating adjustment of the stator's position.

[0009] The present invention is achieved by adopting the following technical solutions:

[0010] A method for lifting a quarter-lobe stator of a hydro-generator comprises the following steps:

[0011] Step S1. Measure and determine the center of gravity of the quarter-lobed stator before and after the stator bar is installed;

[0012] Step S2. Based on the center of gravity, determine the positions of the main lifting point and the auxiliary lifting point for each lift, specifically including: calculating the parameters according to the following formula ds The value of is used to determine whether the supporting round steel in the ventilation opening near the stator joint plate on the back of each side of the quarter-petal stator has the required main hanging point position:

[0013] ,

[0014] Where,d 1 is the distance from the center of gravity of the quarter-petal stator to the center of the circle, d 2 is the distance between the center of the quarter-petal stator and the proposed main suspension point. d 3 is the preset safety distance; ds The distance between the center of gravity of the quarter-petal stator and the proposed main suspension point;

[0015] like ds If ≥0, it is determined that the supporting round steel in the vent has the required main hanging point position, and the main hanging point is set accordingly, and an auxiliary hanging point is set on the supporting round steel in the vent in the middle of the quarter-petal stator;

[0016] like ds <0, it is determined that the supporting round steel in the vent does not have a main lifting point position that meets the requirements, and a mounting frame is provided. The bottom of the mounting frame is connected to at least two sets of sleeves of the stator base through support arms and screws; the mounting frame is provided with a plurality of lifting ears, and the auxiliary lifting points and the main lifting points are respectively provided on the lifting ears;

[0017] Step S3: Install the lifting device. The lifting device cooperates with the main lifting point and the auxiliary lifting point to achieve lifting and posture adjustment of the quarter-petal stator.

[0018] The main hanging point in the vent is arranged at the upper half of the stator base, and the auxiliary hanging point in the vent is arranged at the lower half of the stator base.

[0019] The main hanging point in the vent is set below the second ring plate of the stator base. Reinforcements are respectively set between the first and second ring plates and between the second and third ring plates of the stator base. The reinforcements include ribs and reinforcing round steel.

[0020] The mounting frame includes a mounting frame body and a plurality of cantilevers respectively connected to the mounting frame body; the cantilevers are arranged at intervals, and the support arms are respectively arranged at the bottom of the cantilevers; the main hanging point is arranged on the hanging ear at the top of the cantilever, and the auxiliary hanging point is arranged on the hanging ear at the top of the mounting frame body, and the auxiliary hanging point is arranged on the inner diameter side of the quarter-lobe stator.

[0021] The lifting device includes a hand chain hoist and a bridge crane hook connected by a wire rope;

[0022] When the main lifting point is set in the vent, the lifting device also includes a lifting beam, the bridge crane hook is connected to the two ends of the lifting beam through a first steel wire rope; the two ends of the lifting beam are connected to the two main lifting points through a second steel wire rope, and the second steel wire rope is wound around the supporting round steel of the upper half of the stator base; the hand hoist is connected to the auxiliary lifting point through a third steel wire rope, and the third steel wire rope is wound around the supporting round steel of the lower half of the stator base;

[0023] When the main lifting point is set on the lifting lug on the mounting frame, the bridge crane hook is connected to the lifting lug at the top of the cantilever through the fourth steel wire rope, and the hand hoist is connected to the lifting lug at the top of the mounting frame body through the fifth steel wire rope.

[0024] Before lifting in step S3, the method further includes: setting a bottom pier at the lower end of the quarter-petal stator, wherein the bottom pier includes a fixed pier and a temporary support; the temporary supports are respectively set on both sides of the lower ring plate of the quarter-petal stator near the stator joint plate, and the center of gravity of the quarter-petal stator is within the polygon formed by the two temporary supports and the fixed pier.

[0025] Adjusting the posture of the quarter-petal stator specifically refers to: adjusting the posture of the quarter-petal stator by a hand chain hoist, specifically including: using a lifting device to test lift the quarter-petal stator and lift it off the bottom pier; observing the gap between the lifted quarter-petal stator and the adjacent quarter-petal stator;

[0026] When the lifting point is set in the ventilation hole, if the upper end gap is greater than the lower end gap by more than 1mm, continue to operate the hand chain hoist to reduce the distance between the auxiliary lifting point and the bridge crane hook. If the deviation between the upper end gap and the lower end gap is less than 1mm, there is no need to operate the hand chain hoist.

[0027] When the lifting point is set on the mounting frame, if the upper end gap is smaller than the lower end gap by more than 1mm, continue to operate the hand hoist to reduce the distance between the auxiliary lifting point and the bridge crane hook. If the deviation between the upper end gap and the lower end gap is less than 1mm, there is no need to operate the hand hoist.

[0028] During the posture adjustment process, it also includes setting L-shaped copper pads of the same thickness in the upper end gap and the lower end gap, one end of the L-shaped copper pad is set in the upper end gap and the lower end gap, and the other end is connected to the outer surface of the stator joint plate; when adjusting the posture, the hand hoist is operated until the upper and lower end joint surfaces of the stator are in contact with the L-shaped copper pad without a gap.

[0029] A first protective steel tube is provided on the contact surface between the second steel wire rope and the second layer of ring plate, and a first slot for inserting into the second layer of ring plate is provided on the first protective steel tube; a second protective steel tube is provided on the contact surface between the third steel wire rope and the corresponding layer of ring plate, and a second protective steel tube is provided on the second protective steel tube for inserting into the corresponding layer of ring plate.

[0030] A transition shackle is provided in the middle of the second steel wire rope and / or the fourth steel wire rope.

[0031] A method for installing a quarter-lobe stator of a hydro-generator comprises the following steps:

[0032] Step 1. Set up two temporary supports under the quarter-lobed stator to be opened.

[0033] Step 2. Disconnect the quarter-lobed stator to be removed from the adjacent quarter-lobed stator.

[0034] Step 3. Use the above lifting method to lift the first quarter-petal stator to be opened and adjust its posture;

[0035] Step 4. Lift the quarter-petal stator, place it, and secure it in the designated location.

[0036] Step 5. Following steps 1 to 4, lift the remaining three quarter-lobed stators and secure them in their designated locations.

[0037] Step 6. Stator offline operation;

[0038] Step 7. Once the stator is off the assembly line, use the above lifting method to hoist the quarter-lobed stator onto a dedicated transport base and transport it to the construction site.

[0039] Step 8. Use the above lifting method to lift the first quarter-lobed stator to be opened and adjust its posture. Hoist the quarter-lobed stator to the fixed pier in the installation room on the construction site and set up two temporary supports.

[0040] Step 9. Following step 8, lift the other three quarter-lobed stators and secure them in their designated locations.

[0041] Step 10. Assemble the quarter-lobes of the stator into a circle and remove the temporary supports.

[0042] When the quarter-lobed stator is assembled into a circle, measure the roundness. At the joint surface of the quarter-lobed stator where the diameter is smaller than the average diameter, add insulating spacers or felt to make adjustments until the roundness meets the requirements.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. Since the quarter-lobe stator tends to tilt inward after being hoisted, and since no lifting points can be set on the inside of the stator, it is very difficult to adjust it back to the correct posture. Not to mention, the center of gravity of the stator will change before and after the installation of the wire rods, and the center of gravity position will also be different between different stators, which makes it very difficult to lift and adjust the posture of the quarter-lobe stator. The present invention is provided with two groups of lifting points, each group of lifting points includes a main lifting point and a corresponding auxiliary lifting point. The lifting point can be selected at a suitable position based on the center of gravity position, thereby adapting to the lifting requirements of quarter-lobe stators with different center of gravity positions.

[0045] The present invention utilizes the supporting round steel in the ventilation opening of the stator frame itself or the sleeve of the stator frame to set the hanging point. Compared with the method of directly welding the lifting lugs on the stator frame in the prior art, the present invention does not damage the structure of the stator frame and does not require subsequent removal of the welds, thereby reducing a large amount of manual labor and time costs, and avoiding the safety pollution or damage risks that may occur during the welding and removal processes.

[0046] When the hanging point is set in the vent, no special hanging equipment is required. If the hanging point is set on the lifting ear of the mounting frame, only the mounting frame needs to be designed separately. However, through this mounting frame, multiple tangentially and radially arranged ribs can be set to strengthen the hanging point position, solving the problem that the hanging point cannot be set on the inner diameter side of the existing stator.

[0047] Based on the two sets of lifting points specially set up in the present invention, through the mutual cooperation of the main lifting points and the auxiliary lifting points, the posture adjustment of the stator can be better achieved, ensuring that the quarter-lobe stator is in a vertical posture after lifting, avoiding the quarter-lobe stator from tipping over during the lifting process or in a naturally upright state, and ensuring the safe lifting, disassembly and installation of the quarter-lobe stator.

[0048] 2. In the present invention, the main hanging point in the vent is set at the upper part of the stator base. In the absence of a hanging point on the inner side of the stator, the stator is more stable and not prone to tilting inward. The auxiliary hanging point in the vent is set at the lower part of the stator base, which has a longer lever arm and makes it easier to adjust the stator posture.

[0049] 3. Reinforcements are installed between the first and second ring plates, and between the second and third ring plates, to increase the connection rigidity and deformation resistance between the ring plates. When the main lifting point is subjected to concentrated loads, the reinforcements strengthen the support system near the main lifting point, ensuring more uniform and stable load transfer throughout the lifting process. This design also does not occupy external space and does not affect the installation of wire rods, the layout of the ventilation system, or subsequent maintenance operations.

[0050] 4. The structural design of the mounting frame enables the positions of the main lifting point and the auxiliary lifting point to be flexibly set, which can better achieve lifting and posture adjustment.

[0051] 5. In the present invention, when the main lifting point is set in the vent, the second steel wire rope is wound around the supporting round steel on the upper half of the stator base, and cooperates with the ring plate to achieve the lifting of the main lifting point. This arrangement not only enhances the stability during the lifting process, but also disperses the load and reduces local stress concentration. The third steel wire rope is wound around the supporting round steel on the lower half of the stator base, and also cooperates with the ring plate to achieve the lifting of the auxiliary lifting point. This design ensures that the entire structure is evenly stressed during the lifting process, avoiding structural deformation or damage caused by insufficient local load. The hand hoist is connected to the auxiliary lifting point through the third steel wire rope. By adjusting the hand hoist, the posture of the stator can be accurately controlled to ensure that it remains balanced during the lifting process. This not only improves the safety of the operation, but also effectively prevents collisions or other accidents caused by posture imbalance.

[0052] When the main lifting point is set on the lifting eye on the mounting frame, the bridge crane hook is connected to the lifting eye at the top of the cantilever via a fourth wire rope, providing additional lifting support. The hand chain hoist is connected to the lifting eye at the top of the mounting frame via a fifth wire rope, ensuring flexibility and adaptability in different lifting configurations.

[0053] 6. In the present invention, temporary support piers are provided at both ends below the quarter-lobed stator, so that the center of gravity of the quarter-lobed stator is within the polygon formed by the two temporary supports and the fixed piers, thereby preventing the stator from tipping over when in a stationary state.

[0054] 7. In the present invention, the method of adjusting the stator posture by the hand hoist is simple, and through the mutual cooperation of the main lifting point and the auxiliary lifting point, the gap can be adjusted in units of mm, so that the stator maintains a vertical posture, which can better adapt to the lifting of the first disassembled quarter-petal stator and the last installed quarter-petal stator.

[0055] 8. By setting the L-shaped copper pad, the stator posture can be adjusted quickly and accurately.

[0056] 9. The installation of the first and second protective steel tubes prevents the right-angled edges of the stator frame's ring plate from contacting and damaging the corresponding wire ropes. Because the first and second protective steel tubes can be inserted into the corresponding ring plates, they are compact and easy to assemble and disassemble, preventing them from falling or moving.

[0057] 10. In actual operation, the wire ropes at the main lifting points are long and heavy, making disassembly and assembly difficult. By setting a transition shackle in the middle of the wire ropes at the main lifting points, that is, in the middle of the second wire rope, and in the middle of the fourth wire rope, it is only necessary to disassemble and assemble the shorter wire ropes wound around the stator base or mounted on the cantilever of the mounting frame, and the actual operation will be simpler.

[0058] 11. This installation method sets the main lifting points and auxiliary lifting points for each quarter-lobed stator, so that the vertical posture of the stator can be maintained during multiple lifting processes. In particular, for the lifting of the first quarter-lobed stator to be disassembled and the last quarter-lobed stator to be installed, the posture control effect is good, which can ensure the safe lifting, disassembly and installation of the quarter-lobed stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

[0060] Figure 1 This is a schematic diagram of the structure in which the hanging point is set in the vent Figure 1 ;

[0061] Figure 2 This is a schematic diagram of the structure in which the hanging point is set in the vent Figure 2 ;

[0062] Figure 3 For the present invention Figure 1 Schematic diagram of the side structure;

[0063] Figure 4 For the present invention Figure 1 Schematic diagram of the top view of the stator;

[0064] Figure 5 For the present invention Figure 1 Schematic diagram of the top view of the middle stator after it is rounded;

[0065] Figure 6 This is a schematic diagram of the structure in which the hanging point is arranged on the mounting frame in the present invention;

[0066] Figure 7 For the present invention Figure 6 Schematic diagram of the side structure;

[0067] Figure 8 For the present invention Figure 6 Schematic diagram of the top view structure;

[0068] Figure 9 For the present invention Figure 6 A schematic diagram of the top view of the middle mounting frame;

[0069] Figure 10 For the present invention Figure 6 Schematic diagram of the top view of the middle quarter stator;

[0070] Figure 11 This is a schematic diagram of the posture adjustment of a quarter-petal stator in the present invention;

[0071] Figure 12 This is a schematic structural diagram of the L-shaped copper pad in the present invention;

[0072] Figure 13 Schematic diagram of the structure of the stator in the present invention;

[0073] Markings in the figure:

[0074] 1. Bridge crane hook, 2. Transition shackle, 3. Hand hoist, 4. Lifting beam, 5. Shackle, 6. Quarter-petal stator, 7. Fixed pier, 8. Temporary support, 601. Stator joint plate, 602. Reinforced round steel, 603. Support round steel, 604. First layer ring plate, 605. Second layer ring plate, 606. Third layer ring plate, 607. Fourth layer ring plate, 608. Fifth layer ring plate, 609. Center of gravity, 611. Joint handle and bolt, 612. Joint 1. Clamp nut, 10. Rib plate, 11. Mounting frame, 12. Mounting frame body, 13. Cantilever, 14. Support arm, 15. Lifting ear, 16. First wire rope, 17. Second wire rope, 18. Third wire rope, 19. Fourth wire rope, 20. Fifth wire rope, 21. Screw, 22. Casing, 23. Upper end gap, 24. Lower end gap, 25. L-shaped copper spacer, 26. Stator frame, 27. Stator core, 28. Stator wire rod, 29. Stator core slot. DETAILED DESCRIPTION

[0075] Example 1

[0076] As a basic embodiment of the present invention, the present invention includes a method for lifting a quarter-lobe stator of a hydro-generator, comprising the following steps:

[0077] Step S1. Measure and determine the position of the center of gravity 609 of the quarter-lobed stator 6 before and after the stator bars are installed.

[0078] Step S2. Based on the position of the center of gravity 609, determine the position of the main lifting point and the auxiliary lifting point for each lifting. Specifically, it includes: calculating the parameters according to the following formula ds , determine whether the supporting round steel 603 in the ventilation opening near the stator joint plate 601 on the back of both sides of the quarter-petal stator 6 has the required main suspension point position:

[0079] ,

[0080] Where, d 1 is the distance from the center of gravity 609 of the quarter-petal stator 6 to the center of the circle, d 2 is the distance between the center of the quarter-petal stator 6 and the proposed main suspension point. d 3 is the preset safety distance, ds It is the distance between the center of gravity 609 of the quarter-petal stator 6 and the proposed main suspension point.

[0081] like dIf s≥0, it is determined that the supporting round steel 603 in the vent has a main hanging point position that meets the requirements. The main hanging point is set on the supporting round steel 603 in the vent near the stator joint plate 601, and an auxiliary hanging point is set on the supporting round steel 603 in the vent in the middle of the quarter-petal stator 6.

[0082] like d If s < 0, it is determined that the supporting round steel bar 603 in the vent does not have a main suspension point location that meets the requirements. A mounting frame 11 is provided, and the bottom of the mounting frame 11 is connected to at least two sets of sleeves of the stator base 26 via support arms 14 and screws 21. Specifically, each set of sleeves includes two adjacent sleeves 22. The support arms 14 can be connected to two screws 21. The other ends of the two screws 21 are respectively inserted into the two sleeves 22 of the same set. The screws 21 are connected to the stator base 26 through the cooperation of nuts provided on the outside of the sleeves 22 and ring plates.

[0083] The mounting frame 11 is provided with three lifting lugs 15, which can be enclosed to form a triangle. There can be two main lifting points, one on each of the two lifting lugs 15 above the stator frame 26, and the other on the auxiliary lifting point, located on the lug 15 on the inner diameter side of the quarter-lobed stator 6.

[0084] Step S3: Install the lifting device. The lifting device cooperates with the main lifting point and the auxiliary lifting point to achieve the lifting and posture adjustment of the quarter-petal stator 6.

[0085] Example 2

[0086] As a preferred embodiment of the present invention, the present invention includes a method for lifting a quarter-lobed stator of a hydro-generator, comprising the following steps:

[0087] Step S1. Measure and determine the position of the center of gravity 609 of the quarter-lobed stator 6 before and after the stator bars are installed.

[0088] Step S2. Based on the position of the center of gravity 609, determine the position of the main lifting point and the auxiliary lifting point for each lifting. Specifically, it includes: calculating the parameters according to the following formula d The value of s is used to determine whether the supporting round steel 603 in the ventilation opening near the stator joint plate 601 on the back of both sides of the quarter-petal stator 6 has a main hanging point position that meets the requirements.

[0089] ,

[0090] Where, d 1 is the distance from the center of gravity 609 of the quarter-petal stator 6 to the center of the circle, d 2 is the distance between the center of the quarter-petal stator 6 and the proposed main suspension point. d3 is the preset safety distance, ds It is the distance between the center of gravity 609 of the quarter-petal stator 6 and the proposed main suspension point.

[0091] like d If s ≥ 0, it is determined that the supporting round steel bar 603 in the vent has a primary suspension point position that meets the requirements. A corresponding primary suspension point is set, and an auxiliary suspension point is set on the supporting round steel bar 603 in the vent in the middle of the quarter-lobe stator 6. Specifically, the primary suspension point is set in the upper half of the stator frame 26, specifically below the second ring plate 605 or the third ring plate 606, and the auxiliary suspension point is set in the lower half of the stator frame 26.

[0092] like d If s is less than 0, it is determined that the supporting round steel 603 in the vent does not have a main hanging point position that meets the requirements, so a mounting frame 11 is set. The mounting frame 11 includes a mounting frame body 12 and two cantilevers 13 respectively connected to the mounting frame body 12. The two cantilevers 13 are arranged at intervals, and the bottoms of the two cantilevers 13 are respectively connected to the two groups of sleeves located on both sides of the stator base 26 through support arms 14 and screws 21. Specifically, each group of sleeves includes two adjacent sleeves 22, and the bottom of each cantilever 13 is connected to two support arms 14, and the other end of the support arm 14 is against the stator base 26. The cantilever 13 and the support arm 14 are both provided with a through hole for the screw 21 to pass through. Each cantilever 13 is correspondingly provided with two screws 21. One end of the two screws 21 passes through the through holes upward and is connected to the top of the cantilever 13, and the other end is inserted downward into the two sleeves 22 of the same group. The connection between the screw and the stator base 26 is achieved by the cooperation of the nut and the ring plate arranged outside the sleeve 22.

[0093] Each cantilever 13 is provided with a lifting lug 15 at the top, and the mounting frame body 12 is also provided with a lifting lug 15 at the top. The main lifting point is set on the lifting lug 15 at the top of the cantilever 13 and is located above the quarter-lobe stator 6. The auxiliary lifting point is set on the lifting lug 15 at the top of the mounting frame body 12, and is located on the inner diameter side of the quarter-lobe stator 6.

[0094] Step S3: Install the lifting device. The lifting device cooperates with the main lifting point and the auxiliary lifting point to achieve lifting and posture adjustment of the quarter-petal stator 6.

[0095] Example 3

[0096] As another preferred embodiment of the present invention, the present invention includes a method for lifting a quarter-lobed stator of a hydro-generator, comprising the following steps:

[0097] Step S1. Measure and determine the position of the center of gravity 609 of the quarter-lobed stator 6 before and after the stator bars are installed.

[0098] Step S2. Based on the position of the center of gravity 609, determine the position of the main lifting point and the auxiliary lifting point for each lifting. Specifically, it includes: calculating the parameters according to the following formula d The value of s is used to determine whether the supporting round steel 603 in the ventilation opening near the stator joint plate 601 on the back of both sides of the quarter-petal stator 6 has the required main suspension point position:

[0099] ,

[0100] Where, d 1 is the distance from the center of gravity 609 of the quarter-petal stator 6 to the center of the circle, d 2 is the distance between the center of the quarter-petal stator 6 and the proposed main suspension point. d 3 is the preset safety distance, ds It is the distance between the center of gravity 609 of the quarter-petal stator 6 and the proposed main suspension point.

[0101] like d If s≥0, it is determined that the supporting round steel 603 in the ventilation opening has a main hanging point position that meets the requirements, and a main hanging point is set accordingly, and an auxiliary hanging point is set on the supporting round steel 603 in the ventilation opening in the middle of the quarter-petal stator 6.

[0102] like d If s < 0, it is determined that the supporting round steel bar 603 in the vent does not have a suitable primary lifting point location, and a mounting frame 11 is installed. The bottom of the mounting frame 11 is connected to at least two sets of sleeves on the stator frame 26 via support arms 14 and screws 21. The mounting frame 11 is provided with several lifting lugs 15, on which the auxiliary and primary lifting points are located.

[0103] Step S3. Install bottom buttresses at the lower end of the quarter-lobed stator 6. These bottom buttresses include fixed buttresses 7 and temporary supports 8. The temporary supports 8 are located on both sides of the lower ring plate of the quarter-lobed stator 6, near the stator joint plate 601. The center of gravity 609 of the quarter-lobed stator 6 is within the polygon formed by the two temporary supports 8 and the fixed buttresses 7.

[0104] Install the lifting device, which includes a hand chain hoist 3 and a bridge crane hook 1 connected by a wire rope. The lifting device cooperates with the main lifting point and auxiliary lifting point to achieve the lifting and posture adjustment of the quarter-lobed stator 6. Specifically, the lifting of the quarter-lobed stator 6 specifically refers to:

[0105] When the main lifting point is set within the vent, the lifting equipment also includes a lifting beam 4. The bridge crane hook 1 is connected to both ends of the lifting beam 4 via first steel wire ropes 16. The ends of the lifting beam 4 are connected to the two main lifting points via second steel wire ropes 17, which are wound around the supporting round steel 603 in the upper half of the stator base 26. The hand chain hoist 3 is connected to the auxiliary lifting point via a third steel wire rope 18, which is wound around the supporting round steel 603 in the lower half of the stator base 26.

[0106] When the main lifting point is set on the lifting lug 15 on the mounting frame 11, the bridge crane hook 1 is connected to the lifting lug 15 at the top of the cantilever 13 through the fourth steel wire rope 19, and the hand hoist 3 is connected to the lifting lug 15 at the top of the mounting frame body 12 through the fifth steel wire rope 20.

[0107] Adjusting the posture of the quarter-lobed stator 6 specifically refers to adjusting the posture of the quarter-lobed stator 6 using the hand chain hoist 3. Specifically, the steps include: using a lifting device to perform a trial lift, lifting the quarter-lobed stator 6 away from the bottom support pier; and observing the gap between the lifted quarter-lobed stator 6 and the adjacent quarter-lobed stator 6.

[0108] When the lifting point is set inside the vent, the upper end of the lifted quarter-lobed stator 6 will tilt toward the outer diameter. If the upper end gap 23 is greater than the lower end gap 24 by more than 1mm, continue to operate the hand chain hoist 3 to reduce the distance between the auxiliary lifting point and the bridge crane hook 1. If the deviation between the upper end gap 23 and the lower end gap 24 is less than 1mm, then there is no need to operate the hand chain hoist 3.

[0109] When the lifting point is set on the mounting bracket 11, the upper end of the lifted quarter-lobed stator 6 will tilt toward the inner diameter. If the upper end gap 23 is less than the lower end gap 24 by more than 1 mm, continue to operate the hand chain hoist 3 to reduce the distance between the auxiliary lifting point and the bridge crane hook 1. If the deviation between the upper end gap 23 and the lower end gap 24 is less than 1 mm, then the hand chain hoist 3 does not need to be operated.

[0110] Example 4

[0111] As another preferred embodiment of the present invention, the present invention includes a method for lifting a quarter-lobed stator of a hydro-generator. Figure 13 The stator primarily comprises a stator frame 26, a stator core 27, and stator bars 28. The stator frame 26 and stator core 27 are connected together to form a stator core assembly. Stator offline work involves installing the stator bars 28 onto the stator core 27. The stator core 27 is provided with a number of stator core slots 29 evenly distributed around the circumference, into which the stator bars 28 are installed.

[0112] The stator frame 26 is a circular, three-dimensional frame structure composed of wall panels, annular plates, supporting round steel 603, and sleeves 22. If the stator frame 26 is to be split into lobes, stator joint plates 601 are installed between each lobe of the stator frame 26. The stator joint plates 601 connect the lobes of the stator frame 26, ultimately combining the lobes into a complete circle.

[0113] Since the hydro-generator generates heat during operation, ventilation and heat dissipation are necessary. Therefore, a plurality of circumferentially evenly distributed vents are provided on the circumferential wall panels of the stator frame 26 to allow the hot air generated by the generator to escape from the inside of the generator along the vents. After the petaled stator is formed into a complete circle in the construction site workshop, the stator integral lifting tool is used to lift the entire stator to a specific position. Therefore, a plurality of groups of sleeves 22 are evenly distributed around the circumference of the stator frame 26 as interfaces for connecting the stator integral lifting tool and the entire stator. Each group of sleeves 22 and the vents are evenly spaced from each other on the circumference of the stator frame 26.

[0114] Based on the above stator structure, the lifting method of the quarter-lobe stator 6 includes the following steps:

[0115] Step S1: Measure and determine the position of the center of gravity 609 of the quarter-lobed stator 6 before and after the stator bar is installed. Specifically, the position of the center of gravity 609 can be measured using a three-dimensional design drawing.

[0116] Step S2. Based on the position of the center of gravity 609, determine the lifting points for each lifting, including the positions of the main lifting points and the auxiliary lifting points. By setting two sets of lifting points, it is possible to adapt to the lifting of the quarter-petal stator 6 with different positions of the center of gravity 609. Specifically, the parameters can be calculated according to the following formula d The value of s is used to determine whether the supporting round steel 603 in the ventilation opening near the stator joint plate 601 on the back of both sides of the quarter-petal stator 6 has the required main suspension point position:

[0117] ,

[0118] Where, d 1 is the distance from the center of gravity 609 of the quarter-petal stator 6 to the center of the circle, d 2 is the distance between the center of the quarter-petal stator 6 and the proposed main suspension point. d 3 is the preset safety distance, ds It is the distance between the center of gravity 609 of the quarter-petal stator 6 and the proposed main suspension point.

[0119] like dIf s ≥ 0, the main lifting point position is determined to meet the requirements on the supporting round steel 603 within the vent. A corresponding main lifting point is set, and an auxiliary lifting point is also set on the supporting round steel 603 within the central vent of the quarter-lobe stator 6. The main lifting point within the vent is set in the upper half of the stator frame 26, and the auxiliary lifting point is set in the lower half of the stator frame 26. More specifically, the stator frame 26 includes a first ring plate 604, a second ring plate 605, a third ring plate 606, a fourth ring plate 607, and a fifth ring plate 608. The main lifting point within the vent is set below the second ring plate 605 of the stator frame 26, and the auxiliary lifting point is set below the fifth ring plate 608 of the stator frame 26.

[0120] In order to improve the stability of the main lifting point, the structure at the main lifting point position is reinforced before lifting. Specifically, reinforcements are respectively provided between the first layer ring plate 604 and the second layer ring plate 605, and between the second layer ring plate 605 and the third layer ring plate 606 of the stator frame 26. The reinforcements include ribs 10 and reinforcing round steels 602. The number of the ribs 10 can be several. The ribs 10 at the position of the supporting round steel 603 are welded and fixed together with the upper and lower layers of ring plates and the supporting round steel 603, and the remaining ribs 10 are only welded with the upper and lower layers of ring plates. The reinforcing round steel 602 is arranged close to one side of the stator joint plate 601, and the welding position of the reinforcing round steel 602 is determined according to the position of the stator joint bolt 611 to ensure that the disassembly and assembly of the joint bolt 611 is not affected. The distances between the reinforcing round steel 602, the rib plate 10, and the rib plate 10 and the supporting round steel 603 between the second and third ring plates 605 and 606 are determined to ensure that the lifting wire rope can pass through.

[0121] Since the rest of the stator frame 26 is surrounded by outer wall panels, and the outer wall panels are relatively thin, lifting lugs cannot be welded on the wall panels, otherwise the welding will damage the wall panels. In the present invention, the main lifting points are set on the supporting round steel 603 and the ring plate on the stator frame 26 at the vent position, and the above-mentioned problem will not occur.

[0122] like d If s<0, it is determined that the supporting round steel 603 in the vent does not have a main hanging point position that meets the requirements, and the mounting frame 11 is set.

[0123] Refer to the instruction manual Figure 9 The mounting frame 11 includes a mounting frame body 12 and three cantilevers 13 connected to the mounting frame body 12 and spaced apart. Figure 10 The stator base 26 is provided with three groups of sleeves, each group of sleeves includes two adjacent sleeves 22, and the position of each group of sleeves on the stator base 26 corresponds to the position of the three cantilevers 13.

[0124] Two support arms 14 are provided at the bottom end of each cantilever 13, distal from the mounting frame body 12. Each cantilever 13, through the two support arms 14, cooperates with a screw 21 to achieve a coupling connection with two sleeves 22 in the same group as the stator base 26. Specifically, one end of each support arm 14 is connected to the bottom of the cantilever 13 via a flange, and the other end is provided with a support plate. This support plate abuts against the first ring plate 604 of the stator base 26 to achieve axial positioning and force transmission.

[0125] The support arm 14 and cantilever arm 13 are provided with corresponding through-holes for threaded rods 21. One end of the threaded rod 21 is inserted into the corresponding sleeve 22 of the stator base 26 and then passes downward through the ring plate of the stator base 26. It then engages with the ring plate in the lower half of the stator base 26, such as the fourth ring plate 607, and is connected to this ring plate using fasteners such as nuts, thereby achieving a fixed connection between the threaded rod 21 and the stator base 26. The other end of the threaded rod 21 then passes upward through the through-holes in the support arm 14 and cantilever arm 13 and is connected to the top of the cantilever arm 13 by snapping together, thus completing the secure assembly between the mounting frame 11 and the stator base 26.

[0126] Because the mounting frame 11 is not restricted by ventilation, multiple tangentially and radially arranged ribs can be installed at the suspension point on the mounting frame 11 to reinforce it, allowing for the installation of a lifting lug 15 on the support frame. Specifically, a lifting lug 15 is also provided at the top of the middle of each of the three cantilevers 13, and this lifting lug 15 is located above the stator base 26. The three lifting lugs 15 are evenly spaced along the arc length of the stator base 26. A lifting lug 15 is also provided at the top of the middle position of the mounting frame body 12, and this lifting lug 15 is located on the inner diameter side of the quarter-lobe stator 6. Therefore, the main suspension point is provided on the lifting lug 15 at the top of the cantilever 13, and the auxiliary suspension point is provided on the lifting lug 15 at the top of the mounting frame body 12, which effectively solves the problem of the inability to set a suspension point on the inner diameter side of the existing stator.

[0127] Step S3. Install bottom buttresses at the lower end of the quarter-lobed stator 6. These bottom buttresses include fixed buttresses 7 and temporary supports 8. The temporary supports 8 are located on both sides of the lower ring plate of the quarter-lobed stator 6, near the stator joint plate 601. The center of gravity 609 of the quarter-lobed stator 6 is within the polygon ABCDE formed by the two temporary supports 8 and the fixed buttresses 7.

[0128] Install the lifting device, which includes a hand chain hoist 3 and a bridge crane hook 1 connected by a wire rope. The lifting and posture adjustment of the quarter-petal stator 6 are achieved through the mutual cooperation of the lifting device, the main lifting point and the auxiliary lifting point.

[0129] Refer to the instruction manual Figure 1 , Instruction Manual Figure 3 And the instruction manual Figure 4When the main lifting point is set in the vent, the lifting device also includes a lifting beam 4. The two ends of the lifting beam 4 are connected to the bridge crane hook 1 through the shackle 5 and the first steel wire rope 16 respectively. The two ends of the lifting beam 4 are also connected to the two main lifting points through the shackle 5 and the second steel wire rope 17 respectively. Specifically, the distance between the reinforcing round steel 602, the rib plate 10 and the supporting round steel 603 on the lower surface of the second layer of ring plate 605 must ensure that the second steel wire rope 17 can be bent and inserted into and wrapped around the supporting round steel 603 under the second layer of ring plate 605 of the stator frame 26, and the second steel wire rope 17 can pass through and then be connected to the lifting beam 4 through the shackle 5. The distance between the reinforcing round steel 602, the rib plate 10 and the supporting round steel 603 is calculated based on the diameter and bending radius of the second steel wire rope 17 or determined by on-site testing. The specific position of the main lifting point is: the second steel wire rope 17 is wound around the supporting round steel 603 and focuses on the position below the second ring plate 605. The distance between the two lifting points on the lifting beam 4 is equal to the span between the two supporting round steels 603 of the quarter-petal stator 6. Figure 2 A transition shackle 2 is also provided in the middle of the second steel wire rope 17, so that when disassembling and assembling, only the shorter second steel wire rope 17 wound around the stator frame 26 needs to be disassembled and assembled, and the actual operation will be relatively simple.

[0130] The bridge crane hook 1 is connected to one end of two hand hoists 3 via steel wire ropes. The two hand hoists 3 are connected to two auxiliary lifting points via third steel wire ropes 18. Specifically, the third steel wire ropes 18 pass through and are wrapped around the supporting round steel 603 below the fifth ring plate 608 of the stator base 26, and then are connected to the hand hoists 3 respectively.

[0131] Furthermore, a first protective steel tube is provided on the contact surface between the second steel wire rope 17 and the second ring plate 605. The first protective steel tube is provided with a first slot for inserting into the second ring plate 605 to prevent the right-angled edge of the second ring plate 605 from contacting the second steel wire rope 17 and cutting the second steel wire rope 17.

[0132] Refer to the instruction manual Figure 6 ~Instruction manual attached Figure 8 When the main lifting point is set on the lifting eye 15 on the mounting frame 11, the bridge crane hook 1 is connected to the lifting eye 15 at the top of the cantilever 13 through the fourth steel wire rope 19, and the hand chain hoist 3 is connected to the lifting eye 15 at the top of the mounting frame body 12 through the fifth steel wire rope 20. A transition shackle 2 can be installed in the middle of the fourth steel wire rope 19.

[0133] Remove the joint bolts 611 and joint nuts 612 between the quarter-lobed stator 6 to be lifted and the adjacent quarter-lobed stator 6, perform a trial lift of the quarter-lobed stator 6, and adjust the posture of the quarter-lobed stator 6 using the hand chain hoist 3. Ensure that the quarter-lobed stator 6 remains upright after lifting to prevent it from tilting and damaging the adjacent two stator lobes.

[0134] Adjusting the posture of the quarter-lobed stator 6 using the hand chain hoist 3 specifically includes: performing a trial lift using a lifting device to lift the quarter-lobed stator 6 away from the bottom support, for example, by 0-2 mm. Observing the gap between the lifted quarter-lobed stator 6 and the adjacent quarter-lobed stator 6.

[0135] Refer to the instruction manual Figure 11 When the lifting point is set in the vent, the upper end of the lifted quarter-petal stator 6 will tilt toward the outer diameter. If the upper end gap 23 is greater than the lower end gap 24 by more than 1 mm, continue to operate the hand winch 3 to reduce the distance between the auxiliary lifting point and the bridge crane hook 1. If the deviation between the upper end gap 23 and the lower end gap 24 is less than 1 mm, there is no need to operate the hand winch 3. When the lifting point is set on the mounting frame 11, the upper end of the lifted quarter-petal stator 6 will tilt toward the inner diameter. If the upper end gap 23 is less than the lower end gap 24 by more than 1 mm, continue to operate the hand winch 3 to reduce the distance between the auxiliary lifting point and the bridge crane hook 1. If the deviation between the upper end gap 23 and the lower end gap 24 is less than 1 mm, there is no need to operate the hand winch 3.

[0136] Among them, during the posture adjustment process, if it is necessary to continue to operate the hand chain hoist 3, L-shaped copper pads 25 of the same thickness can be set in the upper end gap 23 and the lower end gap 24. Figure 12 One end of the L-shaped copper block 25 is positioned within the upper gap 23 and the lower gap 24, while the other end is connected to the outer surface of the stator joint plate 601. Specifically, the L-shaped copper block 25 has two through-holes, and two screw holes are drilled at the upper and lower ends of the stator joint plate 601. The L-shaped copper block 25 is bolted to the stator joint plate 601. The hand chain hoist 3 is operated until the upper and lower joint surfaces of the stator are in contact with the L-shaped copper block 25 without any gap.

[0137] Example 5

[0138] As another preferred embodiment of the present invention, a method for installing a quarter-lobed stator of a hydro-generator according to the present invention comprises the following steps:

[0139] Step 1. Install two temporary supports 8 beneath the quarter-lobed stator 6 to be opened. Before the stator is split into four lobes, two temporary supports 8 are installed beneath the first quarter-lobed stator 6 to be opened. Specifically, temporary supports 8 are installed on the stator lower ring near the stator joint plate 601. The center of gravity 609 of each stator lobe is within the ABCDE polygon formed by the two temporary supports 8 and the three fixed buttresses 7.

[0140] Step 2. Disconnect the connection between the quarter-lobed stator 6 to be lifted and the adjacent quarter-lobed stator 6. That is, remove the joint bolts 611 and joint nuts 612 between the quarter-lobed stator 6 to be lifted and the adjacent quarter-lobed stator 6.

[0141] Step 3. Install the lifting device for the quarter-lobed stator 6. Use the lifting method described in any one of Examples 1 to 4 to lift the first quarter-lobed stator 6 to be lifted and adjust its posture.

[0142] Step 4. Lift the quarter-lobed stator 6 and place and secure it in the designated position. Install three fixed piers 7 at the designated location. Lift the quarter-lobed stator 6 onto the three fixed piers 7 and place two temporary supports 8. Ensure the center of gravity 609 of the quarter-lobed stator 6 is within the ABCDE polygon formed by the three fixed piers 7 and the two temporary supports 8. Adjust the position of the quarter-lobed stator 6. Once the quarter-lobed stator 6 is secure, remove the wire rope, hand hoist 3, lifting beam 4, shackle 5, and other lifting equipment.

[0143] Step 5. According to Steps 1 to 4, lift the other three quarter-petal stators 6 in sequence and fix them in the designated positions.

[0144] Step 6. Stator offline work. Stator offline work refers to installing the stator bars 28 onto the stator core 27.

[0145] Step 7. After the stator is offline, the quarter-lobed stator 6 is hoisted onto a dedicated transport base using the hoisting method described in any one of Examples 1 to 4 and shipped to the construction site.

[0146] Step 8. After arriving at the construction site, install the lifting equipment for the quarter-lobed stator 6. Use the lifting method described in any of Examples 1-4 to lift and adjust the posture of the first quarter-lobed stator 6 to be lifted. Hoist the quarter-lobed stator 6 onto three fixed piers 7 in the construction site installation room. Set up two temporary supports 8 to prevent the stator from toppling in its natural state.

[0147] Step 9. According to step 8, lift the other three quarter-lobed stators 6 in sequence and fix them in the designated positions.

[0148] Step 10. Assemble the quarter-petal stator 6 into a circle on site and remove the temporary support 8.

[0149] Specifically, after the quarter-lobed stator 6 is rounded, the roundness is measured with an inside micrometer. Insulating gaskets or felt are added to the joint surfaces of the quarter-lobed stator 6 where the diameter is smaller than the average diameter, and adjustments are made until the roundness meets the requirements. The thicknesses of the insulating gaskets are 0.2mm, 0.5mm, and 1mm, and the thicknesses of the felt are 1mm and 2mm. The average diameter is the average value of the stator inner diameter measured at multiple points around the circumference (for example, 12 or 16 points evenly distributed around the circumference).

[0150] As the instruction manual Figure 5 As shown, the stator joint bolts 611 and joint nuts 612 are installed to form the four-petal stator into a complete circle, and then the temporary support 8 is removed.

[0151] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical solutions and technical concepts of the present invention without creative mental work, which all fall within the scope of protection of the present invention.

Claims

1. A method for lifting a quarter-lobed stator of a hydro-generator, characterized by: The following steps are involved: Step S1. Measure and determine the center of gravity (609) position of the quarter-lobed stator (6) before and after the stator bar is installed; Step S2. Based on the position of the center of gravity (609), determine the position of the main lifting point and the auxiliary lifting point for each lifting, specifically including: calculating the parameters according to the following formula ds The value of is used to determine whether the supporting round steel (603) in the ventilation opening near the stator joint plate (601) on the back of both sides of the quarter-petal stator (6) has a main hanging point position that meets the requirements: ， Where, d 1 is the distance from the center of gravity (609) of the quarter-petal stator (6) to the center of the circle, d 2 is the distance between the center of the quarter-petal stator (6) and the proposed main suspension point, d 3 is the preset safety distance, ds The distance between the center of gravity (609) of the quarter-petal stator (6) and the proposed main suspension point; like d If s≥0, it is determined that the supporting round steel (603) in the vent has a main hanging point position that meets the requirements, and the main hanging point is set accordingly, and an auxiliary hanging point is set on the supporting round steel (603) in the middle vent of the quarter-petal stator (6); like d If s is less than 0, it is determined that the supporting round steel (603) in the vent does not have a main lifting point position that meets the requirements, and a mounting frame (11) is provided. The bottom of the mounting frame (11) is connected to at least two sets of sleeves of the stator base (26) through a support arm (14) and a screw (21). The mounting frame (11) is provided with a plurality of lifting ears (15), and the auxiliary lifting points and the main lifting points are respectively provided on the lifting ears (15). Step S3. Install the lifting device, and realize the lifting and posture adjustment of the quarter-petal stator (6) through the cooperation between the lifting device, the main lifting point, and the auxiliary lifting point.

2. The method for lifting a quarter-lobed stator of a hydro-generator according to claim 1, characterized in that: The main hanging point in the vent is arranged at the upper half of the stator base (26), and the auxiliary hanging point in the vent is arranged at the lower half of the stator base (26).

3. The method for lifting a quarter-lobed stator of a hydro-generator according to claim 2, characterized in that: The main suspension point in the vent is arranged below the second ring plate (605) of the stator base (26), and reinforcement members are respectively arranged between the first ring plate (604) and the second ring plate (605) of the stator base (26) and between the second ring plate (605) and the third ring plate (606), wherein the reinforcement members include a rib plate (10) and a reinforcing round steel (602).

4. The method for lifting a quarter-lobed stator of a hydro-generator according to claim 1 or 3, characterized in that: The mounting frame (11) includes a mounting frame body (12) and a plurality of cantilevers (13) respectively connected to the mounting frame body (12); the cantilevers (13) are arranged at intervals, and the support arms (14) are respectively arranged at the bottom of the cantilevers (13); the main hanging point is arranged on the hanging ear (15) at the top of the cantilever (13), and the auxiliary hanging point is arranged on the hanging ear (15) at the top of the mounting frame body (12), and the auxiliary hanging point is arranged on the inner diameter side of the quarter-lobe stator (6).

5. The method for lifting a quarter-lobed stator of a hydro-generator according to claim 4, characterized in that: The lifting device comprises a hand chain hoist (3) and a bridge crane hook (1) connected by a steel wire rope; When the main lifting point is set in the ventilation port, the lifting device further includes a lifting beam (4), and the bridge crane hook (1) is connected to both ends of the lifting beam (4) through a first steel wire rope (16); both ends of the lifting beam (4) are connected to the two main lifting points through a second steel wire rope (17), and the second steel wire rope (17) is wound around the supporting round steel (603) of the upper half of the stator base (26); the hand chain hoist (3) is connected to the auxiliary lifting point through a third steel wire rope (18), and the third steel wire rope (18) is wound around the supporting round steel (603) of the lower half of the stator base (26); When the main lifting point is set on the lifting lug (15) on the mounting frame (11), the bridge crane hook (1) is connected to the lifting lug (15) at the top of the cantilever (13) through the fourth wire rope (19), and the hand hoist (3) is connected to the lifting lug (15) at the top of the mounting frame body (12) through the fifth wire rope (20).

6. The method for lifting a quarter-lobed stator of a hydro-generator according to claim 5, characterized in that: Before the lifting is performed in step S3, the method further includes: setting a bottom pier at the lower end of the quarter-petal stator (6), wherein the bottom pier includes a fixed pier (7) and a temporary support (8); the temporary support (8) is respectively set on both sides of the lower ring plate of the quarter-petal stator (6) near the stator joint plate (601), and the center of gravity (609) of the quarter-petal stator (6) is within the polygon formed by the two temporary supports (8) and the fixed pier (7).

7. The method for lifting a quarter-lobed stator of a hydro-generator according to claim 5, characterized in that: Achieving posture adjustment of the quarter-petal stator (6) specifically refers to: adjusting the posture of the quarter-petal stator (6) by means of a hand chain hoist (3), specifically including: performing a trial lifting with a lifting device to lift the quarter-petal stator (6) away from the bottom support pier; observing the gap between the lifted quarter-petal stator (6) and the adjacent quarter-petal stator (6); When the lifting point is set in the ventilation port, if the upper end gap (23) is larger than the lower end gap (24) by more than 1 mm, the hand chain hoist (3) is continued to be operated to reduce the distance between the auxiliary lifting point and the bridge crane hook (1); if the deviation between the upper end gap (23) and the lower end gap (24) is less than 1 mm, the hand chain hoist (3) does not need to be operated; When the lifting point is set on the mounting frame (11), if the upper end gap (23) is smaller than the lower end gap (24) by more than 1 mm, continue to operate the hand chain hoist (3) to reduce the distance between the auxiliary lifting point and the bridge crane hook (1); if the deviation between the upper end gap (23) and the lower end gap (24) is less than 1 mm, there is no need to operate the hand chain hoist (3).

8. The method for lifting a quarter-lobe stator of a hydro-generator according to claim 7, characterized in that: During the posture adjustment process, an L-shaped copper pad (25) of the same thickness is provided in the upper end gap (23) and the lower end gap (24), one end of the L-shaped copper pad (25) is provided in the upper end gap (23) and the lower end gap (24), and the other end is connected to the outer surface of the stator joint plate (601); when adjusting the posture, the hand chain hoist (3) is operated until the upper and lower joint surfaces of the stator are in contact with the L-shaped copper pad (25) without any gap.

9. The method for lifting a quarter-lobed stator of a hydro-generator according to claim 5, characterized in that: A first protective steel tube is provided on the contact surface between the second steel wire rope (17) and the second ring plate (605), and a first notch is provided on the first protective steel tube for inserting into the second ring plate (605); a second protective steel tube is provided on the contact surface between the third steel wire rope (18) and the corresponding ring plate, and a second notch is provided on the second protective steel tube for inserting into the corresponding ring plate.

10. The method for lifting a quarter-lobed stator of a hydro-generator according to claim 5, characterized in that: A transition shackle (2) is provided in the middle of the second steel wire rope (17) and / or the fourth steel wire rope (19).

11. A method for installing a quarter-lobe stator of a hydro-generator, characterized by: The following steps are involved: Step 1. Set up two temporary supports (8) under the quarter-lobed stator (6) to be lifted. Step 2. Disconnect the connection between the quarter-lobed stator (6) to be lifted and the adjacent quarter-lobed stator (6); Step 3. Use the lifting method described in any one of claims 1 to 10 to lift and adjust the posture of the first quarter-petal stator (6) to be lifted; Step 4. Lift the quarter-petal stator (6), place and fix the quarter-petal stator (6) at the designated position; Step 5. According to Steps 1 to 4, lift the other three quarter-petal stators (6) in sequence and fix them in the designated positions respectively; Step 6. Stator offline operation; Step 7. After the stator is offline, use the lifting method described in any one of claims 1 to 10 to lift the quarter-petal stator (6) onto a dedicated transport base and ship it to the construction site; Step 8. Use the lifting method described in any one of claims 1 to 10 to lift and adjust the posture of the first quarter-petal stator (6) to be lifted, lift the quarter-petal stator (6) onto the fixed pier (7) in the installation room on the construction site, and set up two temporary supports (8); Step 9. According to step 8, lift the other three quarter-petal stators (6) in turn and fix them in the designated positions respectively; Step 10. Assemble the quarter-lobed stator (6) into a circle and remove the temporary support (8).

12. The method for installing a quarter-lobed stator of a hydro-generator according to claim 11, characterized in that: When the quarter-lobed stator (6) is completed, the roundness is measured, and insulating pads or felt are added to the joint surface of the quarter-lobed stator (6) where the diameter is smaller than the average diameter to make adjustments until the roundness meets the requirements.

Images