A method and tool for handling generator end cover without removing the rotor

Abstract

A method and tool for handling the generator end cover for maintenance without removing the rotor. The method mainly includes the following steps: using a bearing lifting tool to lift the rear pair of wheels connected to the rotor excitation end; using the excitation end support assembly to support the rear pair of wheels to keep the rotor in place; removing the excitation end lower half cover; after replacing the sealant on the excitation end cover, reinstalling the excitation end cover to the excitation end of the casing; removing the three stationary blade seats above the rotor and fixing the three stationary blade seats below the rotor to the generator rotor; using a bearing lifting tool to lift the front pair of wheels connected to the rotor steam end; using the steam end support assembly to support the front pair of wheels to keep the rotor in place; removing the steam end lower half cover; after replacing the sealant on the steam end cover, reinstalling the steam end cover to the excitation end of the casing. The rotor does not need to be pulled out during the entire process, which greatly shortens the processing time for end cover sealant agglomeration, saves a lot of manpower and material resources, and is conducive to improving the working efficiency of the generator.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant maintenance, and in particular to a method and tool for processing a generator overhaul end cover without removing a rotor. Background Art

[0002] The QFSN-1100-4 1100MW nuclear power generator primarily consists of a casing, stator, rotor, steam end cover, and excitation end cover. The casing is a hollow cylindrical structure with two opposing open ends, called the steam end and excitation end. Both the steam end cover and the excitation end cover consist of upper and lower halves: the steam end cover can be divided into an upper steam end cover and a lower steam end cover, and the excitation end cover can be divided into an upper excitation end cover and a lower excitation end cover. Both the steam end cover and the excitation end cover are equipped with bearing components, primarily consisting of bearing shells and bearing oil seals. The stator is installed within the casing and fixedly connected to it. The rotor is installed within the stator, with a gap between it and the stator. The steam end cover and the excitation end cover are respectively installed at the opposing open ends of the casing. The rotor is supported at both ends by bearings on the steam end cover and the excitation end cover, leaving a gap between the rotor and the stator, allowing the rotor to rotate freely relative to the stator. From a nuclear power generator's structural perspective, the steam-end lower cover and the excitation-end lower cover support the generator rotor and seal the generator casing at both ends, forming a closed circulation ventilation system to prevent dust and foreign matter from entering the generator casing. To ensure a tight seal between the end covers and the casing, a 6mm-wide sealing groove is provided on the upper surface of the end covers. This groove is filled with hydrogen-sealing sealant (Tite Seal 2575) to seal out the 0.52 bar hydrogen gas inside the casing during generator operation.

[0003] The applicant has discovered through practice that the sealant on the generator end cover is prone to caking after a round of overhaul, and the caking of the sealant can easily lead to hydrogen leakage between the end cover and the casing during the operation of the generator. Therefore, when the sealant on the end cover caks, the sealant needs to be replaced. Since the lower half of the end cover not only has to ensure the sealing between the end cover and the casing but also has to support the shafts at both ends of the rotor, during the operation of replacing the end cover sealant, the rotor of the generator is usually pulled out first, and then the lower half of the end cover is separated from the casing, so that the sealant on the lower half can be replaced. However, the time required to pull through the generator rotor is too long, and there are many parts involved in the disassembly, resulting in the work of replacing the end cover sealant requiring a lot of manpower, material resources and time, seriously affecting the working efficiency of the generator. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for processing the end cover of a generator for maintenance without removing the rotor. By adopting the method, the agglomerated sealant on the end cover can be replaced without removing the rotor, which greatly shortens the operation period, saves a lot of manpower and material resources, and is conducive to improving the working efficiency of the generator.

[0005] Another technical problem to be solved by the present invention is to provide a tool for processing the generator overhaul end cover without removing the rotor, and the above-mentioned method is implemented by using the tool.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a method for processing the generator overhaul end cover without removing the rotor, the method comprising the following steps:

[0007] Step S1: Remove the upper half cover of the excitation end, use the bearing lifting tool to lift the rear wheel connected to the rotor excitation end, and remove the bearing at the end cover of the excitation end;

[0008] Step S2: using the excitation end support assembly to support the rear wheel so that the rotor remains in place;

[0009] Step S3, disassembling the lower half cover of the excitation end;

[0010] Step S4: After replacing the sealant on the excitation end cover, reinstall the excitation end cover to the excitation end of the casing;

[0011] Step S5, disassembling the steam end upper cover;

[0012] Step S6: Remove the three stationary blade seats above the rotor, and fix the three stationary blade seats below the rotor to the generator rotor;

[0013] Step S7: Use a bearing lifting tool to lift the front pair of wheels connected to the steam end of the rotor, and remove the bearing at the steam end cover;

[0014] Step S8: Use the steam end support assembly to support the front pair of wheels to keep the rotor in place;

[0015] Step S9, disassembling the steam end lower cover;

[0016] Step S10: After replacing the sealant on the steam end cover, reinstall the steam end cover to the excitation end of the casing.

[0017] By adopting the method described in the above technical solution, the rotor does not need to be extracted during the entire process, which greatly shortens the construction period for treating the end cover sealant agglomeration, saves a lot of manpower and material resources, and is conducive to improving the working efficiency of the generator.

[0018] In the method for processing a generator overhaul end cover without removing the rotor provided by the present invention, step S3 includes the following steps:

[0019] Step S31, removing the oil pipe at the lower part of the lower half cover of the excitation end;

[0020] Step S32: Remove the fastening bolts of the lower half cover of the excitation end to separate the lower half cover of the excitation end from the casing;

[0021] Step S33: sink the lower half cover of the excitation end so that the vertical surface of the lower half cover of the excitation end provided with the sealant is completely exposed.

[0022] In the method for processing a generator end cover without removing the rotor provided by the present invention, in step S6, the step of "fixing the three stationary blade seats below the rotor to the generator rotor" includes:

[0023] Step S61: Use an L-shaped fixing and disassembly tool to fix the three stationary blade seats below the rotor to the generator rotor.

[0024] In the method for processing a generator end cover without removing the rotor provided by the present invention, in step S6, the step of "fixing the three stationary blade seats below the rotor to the generator rotor" includes:

[0025] Step S62: Use the auxiliary support assembly to support and fix the three lower stationary blade seats to the base windshield and end cover windshield of the generator.

[0026] In the method for processing the generator end cover without removing the rotor provided by the present invention, in step S8, the steam end support assembly is installed in the gap between the front pair of wheels and the foundation so that the front pair of wheels are supported on the foundation through the steam end support assembly.

[0027] In the method for processing a generator overhaul end cover without removing the rotor provided by the present invention, step S9 includes:

[0028] Step S91, removing the bearing bush lifting tool;

[0029] Step S92: Remove the oil pipe connected to the lower part of the lower half cover of the steam end;

[0030] Step S93: Remove the bolts of the steam end lower half cover to separate the steam end lower half cover from the casing;

[0031] Step S94: Use a crane to hang the lower half cover of the steam end and place wooden blocks between the lower half cover of the steam end and the casing.

[0032] In order to solve another technical problem mentioned above, the technical solution adopted by the present invention is to provide a tool for processing the generator overhaul end cover without removing the rotor, the tool including a steam end support assembly for installation between the front pair of wheels and the foundation; the steam end support assembly includes a support block and a first pad; the support block includes a first main body, the first main body has a relative arc-shaped support surface and a rest plane, the arc-shaped support surface is used to fit with the front pair of wheels; the first pad is used to support between the support block and the foundation.

[0033] In the tool for processing the generator overhaul end cover without removing the rotor provided by the present invention, the steam end support assembly includes a second pad, and the second pad is used to be supported between the support block and the first pad.

[0034] The tool provided by the present invention for processing a generator overhaul end cover without removing a rotor comprises an auxiliary support assembly for supporting and fixing a stationary blade seat.

[0035] In the tool provided by the present invention for processing the end cover of a generator for maintenance without removing the rotor, the auxiliary support assembly includes a first auxiliary support subassembly for supporting and fixing the front end of the static blade seat and a second auxiliary support subassembly for supporting and fixing the rear end of the static blade seat; the first auxiliary support subassembly includes an arc-shaped support bar for supporting the front end edge of the static blade seat and a plurality of first connecting rods, the upper ends of the plurality of first connecting rods are respectively rotatably connected to the arc-shaped support bar, and the lower ends are respectively rotatably connected to first claws for clamping the inner side convex strips of the end cover windshield; the second auxiliary support subassembly includes a second connecting rod, the upper end of the second connecting rod is rotatably connected to an upper claw for clamping the outer side convex strips of the static blade seat and a lower claw for clamping the inner side convex strips of the base windshield.

[0036] The following beneficial effects can be achieved by implementing the method for repairing the end cover of a generator without removing the rotor provided by the present invention: the method comprises the following steps: step S1, removing the upper half cover of the excitation end, using a bearing lifting tool to lift the rear pair of wheels connected to the excitation end of the rotor, and removing the bearing at the excitation end cover; step S2, using an excitation end support assembly to support the rear pair of wheels so that the rotor remains in place; step S3, removing the lower half cover of the excitation end; step S4, after replacing the sealant on the excitation end cover, reinstalling the excitation end cover to the excitation end of the casing. end; Step S5, remove the upper half of the steam end cover; Step S6, remove the three stationary blade seats above the rotor, and fix the three stationary blade seats below the rotor to the generator rotor; Step S7, use the bearing lifting tool to lift the front pair of wheels connected to the steam end of the rotor, and remove the bearings at the steam end cover; Step S8, use the steam end support assembly to support the front pair of wheels to keep the rotor in place; Step S9, remove the lower half of the steam end cover; Step S10, after replacing the sealant on the steam end cover, reinstall the steam end cover to the excitation end of the casing. By adopting the method described in the above technical solution, the rotor does not need to be pulled out during the whole process, which greatly shortens the working period of the end cover sealant agglomeration treatment, saves a lot of manpower and material resources, and is conducive to improving the working efficiency of the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can also derive other drawings based on the provided drawings without inventive work.

[0038] Figure 1 is a schematic diagram of the structure of the generator;

[0039] Figure 2 This is a photo of the stationary blade seat;

[0040] Figure 3 Schematic diagram of the positional relationship between the six-section stator blade seat and the generator rotor;

[0041] Figure 4 A schematic diagram of the three-dimensional structure of the support block provided by the present invention;

[0042] Figure 5 for Figure 4 Dimensional drawing of the middle support block (1), the dimensions in the figure are in mm;

[0043] Figure 6 for Figure 4 Dimensional drawing of the middle support block (2), the dimensions in the figure are in mm;

[0044] Figure 7 for Figure 4Dimensional drawing of the middle support block (3), the dimensions in the figure are in mm;

[0045] Figure 8 A schematic diagram of the three-dimensional structure of the first cushion block provided by the present invention;

[0046] Figure 9 for Figure 8 Dimensional drawing of the first spacer (1), the dimensions in the drawing are in mm;

[0047] Figure 10 for Figure 8 Dimensional drawing of the first cushion block (2), the dimensions in the figure are in mm;

[0048] Figure 11 for Figure 8 Dimensional drawing of the first cushion block (3), the dimensions in the figure are in mm;

[0049] Figure 12 A schematic diagram of the three-dimensional structure of the second cushion block provided by the present invention;

[0050] Figure 13 for Figure 12 Dimensional drawing of the first spacer (1), the dimensions in the drawing are in mm;

[0051] Figure 14 A schematic structural diagram of the first auxiliary support subassembly provided by the present invention;

[0052] Figure 15 This is a schematic structural diagram of the second auxiliary support subassembly provided by the present invention.

[0053] Description of the accompanying drawings in the specific implementation manner:

[0054]

[0055] DETAILED DESCRIPTION

[0056] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate exemplary embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0057] First, those skilled in the art should know that:

[0058] QFSN-1100-4 1100MW nuclear power generator mainly includes casing, stator, rotor, steam end cover and excitation end cover (see Figure 1); The casing is a hollow cylindrical structure, and the two opposite open ends are respectively called the steam end and the excitation end; the steam end cover and the excitation end cover are both composed of upper and lower halves, that is, the steam end cover can be divided into the steam end upper half cover and the steam end lower half cover, and the excitation end cover can be divided into the excitation end upper half cover and the excitation end lower half cover. Bearing components are installed on both the steam end cover and the excitation end cover, and the bearing components are mainly composed of bearing shells and bearing oil seals; the stator is installed in the casing and fixedly connected to the casing; the rotor is installed in the stator, and a gap is left between it and the stator. The steam end of the rotor is connected to a front pair of wheels (i.e., a coupling), and the excitation end is connected to a rear pair of wheels (i.e., a coupling); the steam end cover and the excitation end cover are respectively covered at the two opposite open ends of the casing; the two ends of the rotor are supported by the bearings of the steam end cover and the excitation end cover, so that a gap is left between the rotor and the stator, and the rotor can rotate freely relative to the stator.

[0059] The six arc segments of the stationary blade seat of the QFSN-1100-4 1100MW nuclear power generator steam end ( Figure 2 The photo of a section of static blade seat is shown) and are arranged in sequence on a cylindrical surface 412; there are 2 measuring holes on each section of static blade seat, a total of 12 holes; the inner side of each section of static blade seat is provided with 8 levels of wind guide vanes (i.e. static blades), a total of 1872 pieces, and each level has 39 wind guide vanes; each section of static blade seat is stamped with a number at the joint, and the joint surfaces between the sections of static blade seat are tightened by stainless steel positioning bolts, connecting bolts, nuts and tongue-shaped gaskets, and the positions of the sections of static blade seat cannot be interchanged, and must be seated in the correct position during installation; the front end of each section of static blade seat is connected and fixed to the end cover wind shield (the upper three sections of static blade seat are fixed to the upper half of the end cover wind shield with bolts, and the lower three sections of static blade seat are fixed to the lower half of the end cover wind shield with bolts); the rear end of each section of static blade seat is positioned by 8 radial top screws; the six arc-segment static blade seats surround the generator rotor ( Figure 3The stator seat (showing the positional relationship between the stator seat and the generator rotor) is located between the end cover windshield and the base windshield. The generator rotor includes a cylindrical rotor seat, with eight rings of axial fan blades (i.e., rotor blades) on its outer surface. The radial clearance between each stator seat segment and the generator rotor's axial fan blades is very narrow, with the smallest being only 1.20 mm. During the installation and removal of the generator stator seat, the tools used to completely separate the stator seat from the generator rotor include a coupling shaft, a bracket, and a dedicated support beam (factory-supplied). The lower end of the dedicated support beam is fixedly connected to the front end of the stator seat via the coupling shaft and bracket. A crane uses the lifting beam to lift the stator seat to a certain height and then drags it forward until it is completely separated from the generator rotor, completing the removal operation. This operation requires that the stator seat to be lifted out must be positioned directly above the generator rotor. Currently, this is achieved by frequently rotating the rotor and disassembling the factory-supplied L-shaped fixed removal tool. The connecting shaft, bracket, special support beam, and L-shaped fixing and disassembly tool mentioned above are commonly used tools well known to those skilled in the art, and will not be described in detail here.

[0060] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "front," "rear," and similar expressions used herein are for illustrative purposes only.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0062] Terms containing ordinal numbers, such as "first" and "second," used in this specification may be used to describe various components, but these components are not limited by these terms. These terms are used solely to distinguish one component from another. For example, a first component may be named a second component, and similarly, a second component may be named a first component, without departing from the scope of the present invention.

[0063] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the drawings and specific implementation methods of the specification. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0064] Example 1

[0065] This embodiment provides a method for processing the generator overhaul end cover without removing the rotor. The method is particularly suitable for processing the end cover sealant agglomeration problem of the QFSN-1100-4 type 1100MW nuclear power generator without removing the rotor.

[0066] In this embodiment, the method includes the following steps:

[0067] Step S1: Remove the upper half cover of the excitation end, use the bearing lifting tool to lift the rear wheel connected to the rotor excitation end, and remove the bearing at the end cover of the excitation end;

[0068] Step S2: using the excitation end support assembly to support the rear wheel so that the rotor remains in place;

[0069] Step S3, disassembling the lower half cover of the excitation end;

[0070] Step S4: After replacing the sealant on the excitation end cover, reinstall the excitation end cover to the excitation end of the casing;

[0071] Step S5, disassembling the steam end upper cover;

[0072] Step S6: Remove the three stationary blade seats above the rotor, and fix the three stationary blade seats below the rotor to the generator rotor;

[0073] Step S7: Use a bearing lifting tool to lift the front pair of wheels connected to the steam end of the rotor, and remove the bearing at the steam end cover;

[0074] Step S8: Use the steam end support assembly to support the front pair of wheels to keep the rotor in place;

[0075] Step S9, disassembling the steam end lower cover;

[0076] Step S10: After replacing the sealant on the steam end cover, reinstall the steam end cover to the excitation end of the casing.

[0077] By employing the method described in the above technical solution, the agglomerated sealant on the generator excitation and steam end covers can be efficiently replaced without removing the rotor. Compared to existing technologies, this method offers a significant advantage in that the rotor does not need to be removed during the entire process, significantly shortening the time required to remove agglomerated sealant from the end covers, saving significant manpower and resources, and ultimately improving generator efficiency.

[0078] In this embodiment, the bearing bushing lifting tool described in step S1 is a commonly used tool well known to those skilled in the art and will not be described in detail here. After the upper half cover of the excitation end is disassembled, it can be directly moved to a spacious space to facilitate the replacement of the agglomerated sealant on the upper half cover of the excitation end.

[0079] In this embodiment, in step S2, those skilled in the art will understand that the rear pair of wheels connected to the rotor excitation end is a coupling. The excitation end support assembly adopts the "Generator Rotor Extension Support and Automatic Alignment Device" provided in the applicant's previous patent application number CN201720542706.X, entitled "Generator Rotor Extension Support and Automatic Alignment Device." The structure and use of the excitation end support assembly can be found in the aforementioned patent.

[0080] In this embodiment, step S3 includes the following steps:

[0081] Step S31, removing the oil pipe at the lower part of the lower half cover of the excitation end;

[0082] Step S32: Remove the fastening bolts of the lower half cover of the excitation end to separate the lower half cover of the excitation end from the casing;

[0083] Step S33: sink the lower half cover of the excitation end so that the vertical surface of the lower half cover of the excitation end provided with the sealant is completely exposed.

[0084] Specifically, in step S33, the lower half of the excitation end cover is connected to the upper half of the casing via at least two chains. The lower half of the excitation end cover is gradually lowered by adjusting the length of the chains to fully expose the upper surface of the lower half of the excitation end cover where the sealant is applied. This allows the operator to replace any accumulated sealant on the lower half of the excitation end cover.

[0085] In this embodiment, in step S4, the entire excitation end cover is reinstalled onto the casing using conventional installation methods. The general process is as follows: the excitation end lower cover is lifted to the installation position and reconnected to the casing using bolts. The bearings are then installed on the excitation end lower cover, followed by the installation of the excitation end upper cover. Once installation is complete, the excitation end support assembly can be removed.

[0086] In this embodiment, in step S5, the steam end upper cover can be directly moved to a spacious space after being disassembled, so that the operator can replace the agglomerated sealant of the steam end upper cover.

[0087] In this embodiment, in step S6, the step of “fixing the three stationary blade seats below the rotor to the generator rotor” includes:

[0088] Step S61: Use an L-shaped fixing and disassembly tool to fix the three stationary blade seats below the rotor to the generator rotor.

[0089] In this embodiment, in step S6, the step of “fixing the three stationary blade seats below the rotor to the generator rotor” further includes:

[0090] Step S62: Use the auxiliary support assembly to support and fix the three lower stationary blade seats to the base windshield and end cover windshield of the generator.

[0091] Specifically, the auxiliary support assembly includes a first auxiliary support subassembly for supporting the front end of the fixed stationary blade seat and a second auxiliary support subassembly for supporting the rear end of the fixed stationary blade seat.

[0092] See also Figure 14 The first auxiliary support subassembly includes an arc-shaped support bar 41 for supporting the front edge of the stationary blade seat and a plurality of first connecting rods 42. The upper ends of the plurality of first connecting rods 42 are rotatably connected to the arc-shaped support bar 41, and the lower ends are rotatably connected to first claws 43 for clamping the inner ridges of the end cover windshield. The arc-shaped support bar 41 includes an arc-shaped plane 411 and a cylindrical surface 412 connected to the edge of the arc-shaped plane 411. The curvature of the cylindrical surface 412 matches the stationary blade seat and is used to support the stationary blade seat. Four first connecting rods 42 are connected to the lower side of the cylindrical surface 412. The first claw 43 is generally "concave" in shape, and includes a first top plate 431 connected to the first connecting rod 42 and two first clamping plates 432 extending vertically downward from the two end edges of the first top plate 431. The two first clamping plates 432 are used to clamp the inner ridges of the end cover windshield together.

[0093] See also Figure 15 The second auxiliary support subassembly includes a second connecting rod 51, the upper end of which is rotatably connected to an upper claw 52 for clamping the outer rib of the stationary blade seat and a lower claw 53 for clamping the inner rib of the base windshield. The upper claw 52 is generally concave in shape and includes a first bottom plate 521 connected to the second connecting rod 51 and two second clamping plates 522 extending vertically upward from the two end edges of the first bottom plate 521. The two second clamping plates 522 are used to jointly clamp the outer rib of the stationary blade seat. The lower claw 53 is generally concave in shape and includes a second top plate 531 connected to the second connecting rod 51 and two third clamping plates 532 extending vertically downward from the two end edges of the second top plate 531. The two third clamping plates 532 are used to jointly clamp the inner rib of the base windshield.

[0094] In this embodiment, in step S8, the steam end support assembly is installed in the gap between the front pair of wheels and the foundation so that the front pair of wheels are supported on the foundation through the steam end support assembly.

[0095] Specifically, the steam end support assembly includes a support block 1 (see Figure 4 ) and the first pad 2 (see Figure 8 ); the support block 1 includes a first main body 11, the first main body 11 has a relative arc-shaped support surface 111 and abutting plane 112, the arc-shaped support surface 111 is used to fit with the front pair of wheels; the first pad 2 is used to support between the support block 1 and the foundation. The steam end support assembly also includes a second pad 3 (see Figure 12 ), the second pad 3 is used to support between the support block 1 and the first pad 2.

[0096] Furthermore, first handles 12 are provided on both sides of the first main body 11 of the support block 1 to facilitate the operator to carry and prevent injuries to the hands during operation (see Figure 4 ).

[0097] Furthermore, the first cushion block 2 includes a second main body 21 in the shape of a rectangular parallelepiped, and second handles 22 are provided on opposite sides of the second main body 21 to facilitate the operator to carry and prevent injuries to the hands during operation (see Figure 8 ).

[0098] Furthermore, the second pad 3 is in the shape of a rectangular parallelepiped, and a through hole 31 is provided on each of the two opposite sides thereof, so as to facilitate the operator to carry it and prevent the operator from getting hurt during the operation (see Figure 12 ).

[0099] The full length and full width of the support block 1 , the first cushion block 2 , and the second cushion block 3 are the same, and the thickness of the second cushion block 3 is smaller than that of the first cushion block 2 .

[0100] The dimensions of the support block 1 are shown in Figure 5-Figure 7 .

[0101] The dimensions of the first cushion block 2 are shown in FIG. Figures 9-11 .

[0102] The dimensions of the second cushion block 3 refer to Figure 13 .

[0103] When the steam end support assembly is installed in the gap between the front pair of wheels and the foundation, the first pad 2 rests on the foundation, the support block 1 is supported on the front pair of wheels, and the second pad 3 is clamped between the support block 1 and the first pad 2.

[0104] The actual force-bearing position of support block 1 is axially forward of the generator rotor's front wheel pair. Furthermore, the centerline directly below must not align with the centerline of the pin hole to prevent deformation of the pin hole. The support block 1, the first pad 2, and the second pad 3 must be installed securely and correctly. After the support block 1 is subjected to force, let it rest for ten minutes. Use a dial indicator on the generator rotor's front wheel pair to check for rotor sinking. Also, use a dial indicator on the left and right sides of the rotor to monitor whether the rotor pad is tilted.

[0105] In this embodiment, step S9 includes:

[0106] Step S91, removing the bearing bush lifting tool;

[0107] Step S92: Remove the oil pipe connected to the lower part of the lower half cover of the steam end;

[0108] Step S93: Remove the bolts of the steam end lower half cover to separate the steam end lower half cover from the casing;

[0109] Step S94: Use a crane to hang the lower half cover of the steam end and place wooden blocks between the lower half cover of the steam end and the casing.

[0110] Therefore, when the operator is handling the sealant agglomerated on the lower half of the steam end cover in the generator stator chamber, a wooden block can be placed between the lower half of the steam end cover and the casing to prevent hands from being pinched.

[0111] In this embodiment, in step S10, the entire steam end cover is reinstalled on the casing using conventional installation methods. The general process involves removing the wooden block between the steam end lower cover and the casing, reconnecting the steam end lower cover to the casing with bolts, removing the auxiliary support assembly and L-shaped fixing and removal tool, reinstalling the removed three-stage stator blade seat, installing the bearing on the steam end lower cover, and then installing the steam end upper cover. Once installation is complete, the steam end support assembly can be removed, completing the generator end cover sealant block replacement process.

[0112] The method provided by the present invention for processing the generator overhaul end cover without removing the rotor has simple process and convenient operation, is conducive to the standardized management of the overhaul site, and saves a lot of overhaul time.

[0113] Example 2

[0114] This embodiment provides a tool for handling the generator overhaul end cover without removing the rotor. The tool includes a steam end support assembly, an auxiliary support assembly, and an excitation end support assembly.

[0115] The steam end support assembly includes a support block 1 (see Figure 4 ) and the first pad 2 (see Figure 8); the support block 1 includes a first main body 11, the first main body 11 has a relative arc-shaped support surface 111 and abutting plane 112, the arc-shaped support surface 111 is used to fit with the front pair of wheels; the first pad 2 is used to support between the support block 1 and the foundation. The steam end support assembly also includes a second pad 3 (see Figure 12 ), the second pad 3 is used to support between the support block 1 and the first pad 2.

[0116] Furthermore, first handles 12 are provided on both sides of the first main body 11 of the support block 1 to facilitate the operator to carry and prevent injuries to the hands during operation (see Figure 4 ).

[0117] Furthermore, the first cushion block 2 includes a second main body 21 in the shape of a rectangular parallelepiped, and second handles 22 are provided on opposite sides of the second main body 21 to facilitate the operator to carry and prevent injuries to the hands during operation (see Figure 8 ).

[0118] Furthermore, the second pad 3 is in the shape of a rectangular parallelepiped, and a through hole 31 is provided on each of the two opposite sides thereof, so as to facilitate the operator to carry it and prevent the operator from getting hurt during the operation (see Figure 12 ).

[0119] The full length and full width of the support block 1 , the first cushion block 2 , and the second cushion block 3 are the same, and the thickness of the second cushion block 3 is smaller than that of the first cushion block 2 .

[0120] The dimensions of the support block 1 are shown in Figure 5-Figure 7 .

[0121] The dimensions of the first cushion block 2 are shown in FIG. Figures 9-11 .

[0122] The dimensions of the second cushion block 3 refer to Figure 13 .

[0123] The auxiliary support assembly includes a first auxiliary support subassembly for supporting the front end of the stationary vane seat and a second auxiliary support subassembly for supporting the rear end of the stationary vane seat. Figure 14 The first auxiliary support subassembly includes an arc-shaped support bar 41 for supporting the front edge of the stationary blade seat and a plurality of first connecting rods 42. The upper ends of the plurality of first connecting rods 42 are rotatably connected to the arc-shaped support bar 41, and the lower ends are rotatably connected to first claws 43 for clamping the inner convex strips of the end cover windshield. Figure 15 The second auxiliary support subassembly includes a second connecting rod 51, the upper end of which is rotatably connected to an upper claw 52 for clamping the outer convex strip of the stationary blade seat and a lower claw 53 for clamping the inner convex strip of the base windshield.

[0124] The arcuate support bar 41 includes an arcuate plane 411 and a cylindrical surface 412 connected to the edge of the arcuate plane 411. The curvature of the cylindrical surface 412 matches the stator blade seat and is used to support the stator blade seat. Four first connecting rods 42 are connected to the underside of the cylindrical surface 412. The first claw 43 is generally concave in shape and includes a first top plate 431 connected to the first connecting rod 42 and two first clamping plates 432 extending vertically downward from the two end edges of the first top plate 431. The two first clamping plates 432 are used to clamp the inner convex strip of the end cover windshield.

[0125] The upper claw 52 is roughly "concave" in shape, and includes a first base plate 521 connected to the second connecting rod 51 and two second clamping plates 522 extending vertically upward from the two end edges of the first base plate 521, and the two second clamping plates 522 are used to jointly clamp the outer convex strips of the static blade seat.

[0126] The lower claw 53 is roughly "concave" in shape, and includes a second top plate 531 connected to the second connecting rod 51 and two third clamping plates 532 extending vertically downward from the two end edges of the second top plate 531. The two third clamping plates 532 are used to jointly clamp the inner side convex strips of the base windshield.

[0127] The excitation end support assembly adopts the "generator rotor extension support and automatic alignment device" provided in the applicant's previous patent application with application number CN201720542706.X and name "generator rotor extension support and automatic alignment device". The structure and usage method of the excitation end support assembly can be found in the above patent.

[0128] The method of using the tool is described in Example 1 and will not be described in detail here.

[0129] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A method for handling the end cover of a generator without removing the rotor, characterized in that: The method comprises the following steps: Step S1: Remove the upper half cover of the excitation end, use the bearing lifting tool to lift the rear wheel connected to the rotor excitation end, and remove the bearing at the end cover of the excitation end; Step S2: using the excitation end support assembly to support the rear wheel so that the rotor remains in place; Step S3, disassembling the lower half cover of the excitation end; Step S4: After replacing the sealant on the excitation end cover, reinstall the excitation end cover to the excitation end of the casing; Step S5, disassembling the steam end upper cover; Step S6: Remove the three stationary blade seats above the rotor, and fix the three stationary blade seats below the rotor to the generator rotor; Step S61: Use an L-shaped fixing and disassembly tool to fix the three stationary blade seats below the rotor to the generator rotor; Step S62: Use the auxiliary support assembly to support and fix the three lower stationary blade seats to the base windshield and end cover windshield of the generator; Step S7: Use a bearing lifting tool to lift the front pair of wheels connected to the steam end of the rotor, and remove the bearing at the steam end cover; Step S8: Use the steam end support assembly to support the front pair of wheels to keep the rotor in place; Step S9, disassembling the steam end lower cover; Step S10: After the sealant on the steam end cover is replaced, the steam end cover is reinstalled on the steam end of the casing.

2. The method for processing the generator end cover without removing the rotor according to claim 1, characterized in that: The step S3 comprises the following steps: Step S31, removing the oil pipe at the lower part of the lower half cover of the excitation end; Step S32: Remove the fastening bolts of the lower half cover of the excitation end to separate the lower half cover of the excitation end from the casing; Step S33: sink the lower half cover of the excitation end so that the vertical surface of the lower half cover of the excitation end provided with the sealant is completely exposed.

3. The method for processing the generator end cover without removing the rotor according to claim 1, characterized in that: In the step S8, the steam end support assembly is installed in the gap between the front pair of wheels and the foundation so that the front pair of wheels are supported on the foundation by the steam end support assembly.

4. The method for treating the generator end cover without removing the rotor according to claim 1, characterized in that: The step S9 includes: Step S91, removing the bearing bush lifting tool; Step S92: Remove the oil pipe connected to the lower part of the lower half cover of the steam end; Step S93: Remove the bolts of the steam end lower half cover to separate the steam end lower half cover from the casing; Step S94: Use a crane to hang the lower half cover of the steam end and place wooden blocks between the lower half cover of the steam end and the casing.

5. A tool for handling the generator end cover without removing the rotor, characterized in that: The tool comprises a steam end support assembly for installation between the front pair of wheels and a foundation; the steam end support assembly comprises a support block (1) and a first cushion block (2); the support block (1) comprises a first main body (11), the first main body (11) having opposite arc-shaped support surfaces (111) and abutting planes (112), the arc-shaped support surfaces (111) being used to fit with the front pair of wheels; the first cushion block (2) is used to be supported between the support block (1) and the foundation; The tool includes an auxiliary support assembly for supporting and fixing a stationary blade seat; The auxiliary support assembly includes a first auxiliary support subassembly for supporting and fixing the front end of the stationary blade seat and a second auxiliary support subassembly for supporting and fixing the rear end of the stationary blade seat; the first auxiliary support subassembly includes an arc-shaped support bar (41) for supporting the front end edge of the stationary blade seat and a plurality of first connecting rods (42), the upper ends of the plurality of first connecting rods (42) are respectively rotatably connected to the arc-shaped support bar (41), and the lower ends are respectively rotatably connected to first claws (43) for clamping the inner side convex strips of the end cover windshield; the second auxiliary support subassembly includes a second connecting rod (51), the upper end of the second connecting rod (51) is rotatably connected to an upper claw (52) for clamping the outer side convex strips of the stationary blade seat and a lower claw (53) for clamping the inner side convex strips of the base windshield.

6. The tool for handling the generator end cover without removing the rotor according to claim 5, characterized in that: The steam end support assembly comprises a second pad (3), and the second pad (3) is used to be supported between the support block (1) and the first pad (2).

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