Large vertical hydro-generator rotor reinstallation centering device and method

Abstract

The application discloses a large vertical water turbine generator rotor back installation centering device and method, comprising a centering mechanism, a leveling mechanism and an optical projection mechanism, the leveling mechanism is installed at the lower middle part of the centering mechanism, and the optical projection mechanism is installed at the lower middle part of the leveling mechanism. By coaxially installing the centering device in the rotor center body hole, the centering reference and the shaft coupling reference are unified, the secondary error is eliminated at one step, the device installation is simple, the occupied space is small, the projection observation is direct and unobstructed, the operator can quickly adjust the rotor posture in real time, the rotor collision risk is actively avoided from the source, the hoisting back installation operation of the large-diameter, small-gap and super-heavy vertical water turbine generator rotor is adapted, and the hoisting precision, safety and on-site construction efficiency are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator maintenance equipment technology, and in particular to a large vertical hydro-generator rotor reinstallation and alignment device and method. Background Technology

[0002] Large vertical hydro-generator rotors have diameters exceeding ten meters and are extremely heavy, with a stator-rotor clearance of only 20-30 mm. During hoisting and reassembly by a bridge crane, collisions with the stator are highly likely, causing equipment damage. Currently, rotor rotation relies on a dozen or so workers distributed circumferentially, manually inserting and removing epoxy boards to judge the clearance. This operation depends heavily on experience, involves a large number of workers, is difficult to coordinate, has low alignment accuracy, and poses safety risks associated with working at height. Therefore, we have developed a method and apparatus for reassembling and aligning large vertical hydro-generator rotors, as described in this application.

[0003] A search revealed that Chinese patent document CN116354238A, published on June 30, 2023, discloses a large hydro-generator rotor hoisting alignment and anti-collision auxiliary system and operating method. The system includes an alignment monitoring device, an alignment target device, and anti-collision devices. Multiple alignment monitoring devices are arranged circumferentially along the stator. The number of alignment target devices corresponds to the number of alignment monitoring devices, with each target device paired with one monitoring device. Multiple alignment target devices are installed circumferentially along the rotor's outer edge on the upper surface of the rotor. Multiple anti-collision devices are also installed circumferentially along the rotor's outer edge on the upper surface of the rotor. Each anti-collision device includes anti-collision strips that reciprocate vertically. The alignment monitoring device is used to be mounted on the stator's base surface or on a hoisting platform. Its advantages are: it can effectively solve the problems of low quantitative monitoring, strong reliance on manual labor, and poor real-time performance in the current large-scale hydropower station turbine generator rotor hoisting process for centering monitoring and anti-collision alarm operations; its disadvantages are: firstly, the scheme adopts an external measurement mode of deploying multiple monitoring devices around the stator and installing targets and anti-collision devices on the outer edge of the rotor, which not only requires the completion of complex equipment erection, rotation angle and pitch angle calibration and coordinate calculation, but also has a high operation threshold and is time-consuming on-site construction; secondly, the centering reference of the inner circle of the stator is not consistent with the reference of the main shaft flange of the final coupling of the rotor, which is prone to secondary cumulative error.

[0004] In addition, Chinese patent document CN110526120A, published on October 20, 2020, discloses an auxiliary device and method for hoisting a vertical hydro-generator rotor. This device and method aim to effectively reduce the number of personnel required for hoisting the rotor, improve hoisting efficiency, and effectively avoid the problem of the rotor and stator contacting each other during hoisting. The auxiliary device for hoisting the vertical hydro-generator rotor includes an annular mounting component, several glass plates arranged around the outside of the annular mounting component, connectors connecting the glass plates and the annular mounting component, magnets mounted on the annular mounting component, and laser rangefinders corresponding to each other mounted on the glass plates. The glass plates have an arc-shaped reference line, and the laser beams emitted by the laser rangefinders are perpendicular to the glass plates. The distance between the laser beams emitted by each laser rangefinder and the axis of the annular mounting component is the same. Its shortcomings are as follows: First, this scheme requires the installation of a laser rangefinder with an annular mounting component and a glass plate on both the upper end face of the rotor and the stator frame. Alignment is determined by the position of the laser beams falling on the baseline. Not only does the coaxiality adjustment of the two devices rely on manual measurement with a ruler, resulting in low accuracy and cumbersome installation, but also, because the laser rangefinder is located on the outside of the rotor, the alignment reference is the outer edge of the stator and rotor, which is not connected to the main shaft coupling reference, making it impossible to achieve one-step alignment between hoisting and coupling. Second, the external structure of the glass plate and the annular mounting component occupies the space around the rotor, resulting in poor adaptability to vertical units with large diameters and small gaps. Furthermore, the observation surface of the laser beam is an external glass plate, which is easily affected by the on-site environment during hoisting, limiting the intuitiveness and response speed of attitude adjustment. Third, the hoisting auxiliary device in the stator pit cannot be removed after the rotor is installed. Summary of the Invention

[0005] The technical problem this invention aims to solve is to provide a centering device for the reinstallation of a large vertical hydro-generator rotor. By coaxially installing the centering device within the inner bore of the rotor's central body, the projected axis coincides with the rotor axis and is perpendicular to the top flange surface of the main shaft. During hoisting, an auxiliary projection is projected onto the flange surface, and the rotor's attitude is adjusted accordingly. This not only unifies the centering reference with the coupling reference, eliminating secondary errors in one step, but also features simple installation, small space occupation, intuitive and unobstructed projection observation, and allows operators to quickly adjust the rotor's attitude in real time. It proactively avoids the risk of collision between the stator and rotor from the source, and is suitable for hoisting and reinstalling large-diameter, small-gap, and ultra-heavy vertical hydro-generator rotors, significantly improving hoisting accuracy, safety, and on-site construction efficiency.

[0006] Another technical problem to be solved by the present invention is to provide a centering method for reinstalling the rotor of a large vertical hydro generator.

[0007] To achieve the above objectives, this application provides a large vertical hydro generator rotor reinstallation and alignment device, including an alignment mechanism, a leveling mechanism, and an optical projection mechanism. The leveling mechanism is installed in the lower middle part of the alignment mechanism, and the optical projection mechanism is installed in the lower middle part of the leveling mechanism. The alignment mechanism is used to install and fix it into the central inner hole of the rotor, the leveling mechanism is used to adjust the level of the optical projection mechanism, and the optical projection mechanism is used to project an auxiliary alignment projection onto the flange surface.

[0008] The alignment mechanism includes a support base, a slider, a rotating disk, and a drive rod. The support base has at least three radially and annularly distributed grooves, each containing a slider. One end of the slider extends out of the groove and is supported by a central bore, while the other end has a fixed upper section. The center of the support base is rotatably connected to the lower end of the drive rod. The rotating disk is located above the support base, and the upper end of the drive rod passes through the central bore of the rotating disk, thus being fixed to the rotating disk. A drive section is located at the upper end of the drive rod. The rotating disk has at least three annularly distributed helical holes, corresponding to the positions of the sliding sections, with each sliding section inserted into a specific helical hole. When the rotating disk is rotated by the drive rod, the sliders are driven to extend and retract synchronously through the helical holes.

[0009] A mounting ring is fixed at the bottom center of the support base. Multiple sector-shaped locking blocks are installed inside the mounting ring. The multiple sector-shaped locking blocks surround a disc structure. The center of the disc structure has a tapered hole that is smaller at the top and larger at the bottom. A through hole is provided at the axial center of the drive rod. A locking screw is installed in the through hole. The lower end of the locking screw is provided with a truncated cone that matches the tapered hole. The truncated cone is located inside the tapered hole. After the upper end of the locking screw extends out of the drive rod, a locking nut is screwed on.

[0010] The lower end of the drive rod is provided with a flange, and the bottom of the central hole of the support base is provided with an annular groove. The drive rod passes through the central hole of the support base from bottom to top, and the flange is located in the annular groove.

[0011] The leveling mechanism includes a connecting seat with a threaded countersunk hole at the top. The bottom of the leveling mechanism has a mounting ring with an external thread on its outer circumference. The threaded countersunk hole is screwed into the mounting ring for fixation. At least three adjusting screws are evenly distributed in a ring at the bottom of the connecting seat and mounted via a ball joint structure. The lower ends of the adjusting screws are screwed into the adjusting seat via threads. A base is connected to the bottom of the adjusting seat via a connecting rod. A level is mounted on the upper side of the base, and a connecting screw is located on the lower side of the base. A threaded hole is provided at the top of the optical projection mechanism, which is then fixed to the connecting screw via the threaded hole.

[0012] At least one image acquisition device is installed at the bottom of the optical projection mechanism.

[0013] A method for reinstalling and aligning the rotor of a large vertical hydro-generator, employing the aforementioned alignment device, includes the following steps:

[0014] Step 1: Install an alignment device coaxially inside the central bore of the rotor, ensuring that the axis of the auxiliary projection of the alignment device coincides with the axis of the rotor. Step 2: Align the level of the alignment device so that the axis of the auxiliary projection is perpendicular to the flange surface at the top of the spindle; Step 3: When reinstalling the rotor into the stator, project an auxiliary centering projection onto the flange face using the centering device; Step 4: Observe the position of the auxiliary projection on the flange surface to guide the rotor attitude adjustment and avoid rotor collision with the stator.

[0015] The auxiliary projection is circular; when observing the position of the auxiliary projection on the flange face, the inner hole of the flange face or the bolt holes arranged around the circumference are used as the observation reference.

[0016] It also includes the steps of obtaining the distance between the auxiliary projection and the observation benchmark through the image acquisition device, and the steps of controlling the lifting equipment to make fine adjustments to its position.

[0017] As the rotor falls, the centering device adjusts the focal length of the auxiliary projection according to the speed of the rotor's fall, so that the auxiliary projection is always located between the inner hole of the flange face and the bolt hole.

[0018] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: 1. This invention achieves a breakthrough improvement in hoisting alignment technology by integrating an alignment device coaxially within the rotor's central bore and using the top flange surface of the main shaft as the sole alignment reference. This fundamentally solves the pain points of existing technologies, such as inconsistent reference standards, complex operation, and poor anti-interference capabilities. This solution integrates the alignment device into the rotor's central bore, eliminating the need for any monitoring, target, or ranging devices on the stator periphery or rotor edge. It completely eliminates the cumbersome steps of setting up, calibrating, and manually adjusting coaxiality of multiple devices required in existing technologies, significantly simplifying the on-site construction process, reducing reliance on professional operators, and allowing ordinary hoisting operators to complete the work, thus significantly improving on-site construction efficiency. Simultaneously, the built-in installation structure does not occupy the rotor's external space and does not change the rotor's original center of gravity, perfectly adapting to the hoisting requirements of large-diameter, ultra-heavy vertical hydro-generator rotors. This solves the problems of existing technologies where externally placed multiple devices easily lead to rotor center of gravity shifts and poor adaptability.

[0019] 2. This invention uses the top flange surface of the main shaft as both the centering reference surface and the observation target surface, ensuring complete unification between the hoisting centering reference and the subsequent rotor coupling reference. This achieves precise centering in one step, completely eliminating the secondary cumulative errors caused by existing technologies that use the stator and rotor outer edges as references. This fundamentally guarantees centering accuracy and better meets the actual assembly requirements of vertical hydro-generators. Simultaneously, the centering device projects an auxiliary projection vertically downwards along the rotor axis. The laser path is unobstructed by external factors and unaffected by environmental factors such as personnel movement. The projection offset directly and intuitively reflects the rotor attitude deviation without requiring complex coordinate calculations or data processing. Operators can observe in real time, respond quickly, and adjust the rotor attitude. This solves the problems of existing technologies where oblique or through-beam laser projection is susceptible to interference, has poor real-time performance, and suffers from adjustment lag, making centering operations more efficient and precise.

[0020] 3. This invention actively adjusts the rotor's attitude by observing the projected position on the flange surface in real time, ensuring that the rotor maintains a uniform gap with the stator throughout the entire hoisting and descent process. This represents a technological upgrade from passive anti-collision warning to active alignment and collision prevention. Compared to the passive warning from the pressure sensor in CN116354238A and the laser crossing warning in CN110526120B, this solution avoids the risk of stator-rotor collisions from the source, significantly improving the safety of hoisting operations and effectively preventing equipment damage caused by collisions. Furthermore, this solution requires only one miniaturized built-in alignment device. Compared to the multiple sets of heavy-duty monitoring and ranging devices in existing technologies, the equipment structure is simpler and the cost is lower. Moreover, its installation does not affect other rotor hoisting operations, making it more practical and versatile in the field. It is better suited for high-precision hoisting and reassembly operations of large vertical hydro-generator rotors with a stator-rotor gap of only 20-30mm. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the disassembled structure of the present invention.

[0024] Figure 3 This is a schematic diagram of the main structure of the present invention.

[0025] Figure 4 This is a schematic diagram of the main structure of the alignment mechanism in this invention.

[0026] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of Zhongnong AA.

[0027] Figure 6 This is a schematic diagram of the leveling mechanism and optical projection mechanism in this invention.

[0028] Figure 7 This is a scene diagram illustrating the use of this invention.

[0029] Figure 8 for Figure 7 A magnified view of the area at point K.

[0030] Figure 9 A schematic diagram showing the installation of an alignment device in the central bore of the rotor.

[0031] Figure label: Rotor 1, central inner bore 2, stator 3, main shaft 4, flange face 5, auxiliary projection 6; Centering device 100, alignment mechanism 110, leveling mechanism 120, optical projection mechanism 130; Support base 111, slide groove 1111, mounting ring 1112, slider 112, slide column 1121, rotating disk 113, spiral hole 1131, drive rod 114, drive part 1141, flange 1142, sector-shaped locking block 115, tapered hole 1151, locking screw 116, cone 1161, locking nut 1162.

[0032] Connecting seat 121, threaded countersunk hole 1211, adjusting screw 122, screw part 1221, rotating ring part 1222, ball joint part 1223, adjusting seat 123, base 124, connecting screw 1241, level 125; Threaded hole 131, image acquisition device 132. Detailed Implementation

[0033] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0034] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Example 1: See Figure 1 , 2 According to point 3, the present invention provides a large vertical hydro generator rotor reinstallation and alignment device 100, including an alignment mechanism 110, a leveling mechanism 120, and an optical projection mechanism 130. The leveling mechanism 120 is installed in the lower middle part of the alignment mechanism 110, and the optical projection mechanism 130 is installed in the lower middle part of the leveling mechanism 120. The alignment mechanism 110 is used to install and fix it into the central inner hole 2 of the rotor 1, the leveling mechanism 120 is used to adjust the level of the optical projection mechanism 130, and the optical projection mechanism 130 is used to project an alignment auxiliary projection 6 onto the flange surface 5.

[0037] In use, an alignment device 100 is coaxially installed in the inner bore 2 of the rotor 1, with the axis of the auxiliary projection 6 coinciding with the axis of the rotor 1 and perpendicular to the flange surface 5 at the top of the main shaft 4. During rotor 1 hoisting, the alignment device 100 projects the auxiliary projection 6 onto the flange surface 5 through the optical projection mechanism 130, and adjusts the rotor 1's attitude accordingly. This not only unifies the alignment reference with the coupling reference, eliminating secondary errors in one step, but also features simple installation and small space occupation. Furthermore, the projection observation is intuitive and unobstructed, with strong anti-interference capabilities. Operators can quickly adjust the rotor's attitude in real time, proactively avoiding the risk of stator-rotor collisions from the source. It is suitable for hoisting and reinstalling large-diameter, small-clearance, and ultra-heavy vertical hydro-generator rotors, significantly improving hoisting accuracy, safety, and on-site construction efficiency.

[0038] In this embodiment, the optical projection mechanism 130 can be a projector.

[0039] See Figure 2 , 4 5. The alignment mechanism 110 includes a support base 111, a slider 112, a rotating disk 113, and a drive rod 114. The support base 111 has at least three radially and annularly distributed grooves 1111. The slider 112 is installed in the grooves 1111. One end of the slider 112 extends out of the groove 1111 and is supported by the central inner hole 2. The upper side of the other end is fixed with a sliding column 1121. The center of the support base 111 is rotatably connected to the lower end of the drive rod 114. The rotating disk 113 is located on the upper side of the support base 111. The upper end of the drive rod 114 passes through the central hole of the rotating disk 113 and is fixedly connected to the rotating disk 113. The upper end of the drive rod 114 is provided with a drive part 1141. The rotating disk 113 has at least three annularly distributed spiral holes 1131. The spiral holes 1131 correspond to the positions of the sliding columns 1121, and each sliding column 1121 is inserted into each spiral hole 1131. When the rotating disk 113 is rotated by the drive rod 114, the sliders 112 are driven to extend and retract synchronously through the spiral holes 1131.

[0040] Combination Figure 2 When the drive rod 114 is rotated clockwise, it drives the rotating disk 113 to rotate, and the four helical holes 1131 simultaneously drive the sliding column 1121, causing the four sliders 112 to retract synchronously. When the drive rod 114 is rotated counterclockwise, the four sliders 112 extend synchronously. This achieves the support, fixation, and automatic centering of the alignment mechanism 110.

[0041] The drive unit 1141 can be a rod welded to the drive rod 114, or it can be a polygonal structure set on the drive rod 114.

[0042] Further, see Figure 5A mounting ring 1112 is fixedly provided at the bottom center of the support base 111. Multiple sector-shaped locking blocks 115 are installed inside the mounting ring 1112. The multiple sector-shaped locking blocks 115 surround a disc structure. The center of the disc structure has a tapered hole 1151 that is smaller at the top and larger at the bottom. A through hole is provided at the axial center of the drive rod 114. A locking screw 116 is installed in the through hole. The lower end of the locking screw 116 is provided with a cone 1161 that is adapted to the tapered hole 1151. The cone 1161 is located inside the tapered hole 1151. After the upper end of the locking screw 116 extends out of the drive rod 114, a locking nut 1162 is screwed on. When it is necessary to limit the rotation disk 113, tighten the locking nut 1162. At this time, the cone 1161 moves upward. Since the cone 1161 slides with the cone hole 1151 of the disk structure, and the disk structure is formed by multiple fan-shaped locking blocks 115, when the cone 1161 moves upward, the cone 1161 presses the fan-shaped locking blocks 115 outward, so that the fan-shaped locking blocks 115 are locked with the mounting ring 1112.

[0043] See Figure 5 The lower end of the drive rod 114 is provided with a flange 1142, and the bottom of the central hole of the support base 111 is provided with an annular groove. The drive rod 114 passes through the central hole of the support base 111 from bottom to top, and the flange 1142 is located in the annular groove. The above structure limits the axial positioning of the drive rod 114 and the support base 111, and allows the drive rod 114 and the support base 111 to rotate together.

[0044] See Figure 2 , 3 The leveling mechanism 120 includes a connecting seat 121, with a threaded countersunk hole 1211 at the top. The alignment mechanism 110 has a mounting ring 1112 at the bottom, with an external thread on the outer circumference of the mounting ring 1112. The threaded countersunk hole 1211 is screwed and fixed to the mounting ring 1112. At least three adjusting screws 122 are evenly distributed in a ring at the bottom of the connecting seat 121 and mounted on it via a ball joint structure. The lower ends of the adjusting screws 122 are all threadedly engaged with the adjusting seat 123. The bottom of the adjusting seat 123 is connected to a base 124 via a connecting rod. A level 125 is mounted on the upper side of the base 124, and a connecting screw 1241 is provided on the lower side of the base 124. The optical projection mechanism 130 has a threaded hole 131 at the top and is fixed to the connecting screw 1241 via the threaded hole 131.

[0045] In use, the level of the optical projection mechanism 130 is adjusted by rotating the adjusting screw 122 at different positions and observing through the level 125, so that the axis of the auxiliary projection 6 coincides with the axis of the rotor 1.

[0046] Specifically, see Figure 3The adjusting screw 122 includes a screw part 1221, a rotating ring part 1222, and a ball joint part 1223. The ball joint part 1223 is connected and fixed to the connecting seat 121. The upper end of the screw part 1221 is connected to the ball joint part 1223, so that the screw part 1221 can swing. The lower end of the screw part 1221 is screwed into the corresponding threaded hole on the adjusting seat 123. The rotating ring part 1222 is provided in the middle of the screw part 1221. When adjusting, the rotating ring part 1222 is pinched with fingers to rotate.

[0047] See Figure 6 At least one image acquisition device 132 is installed at the bottom of the optical projection mechanism 130. By setting the image acquisition device 132, the distance between the auxiliary projection 6 and the observation reference at different orientations can be obtained, thereby cooperating with the lifting equipment to fine-tune the position of the rotor 1.

[0048] Example 2: Based on Example 1, see Figure 7 , 8 9. A method for reinstalling and aligning a large vertical hydro-generator rotor, employing an alignment device 100, the method comprising the following steps: Step 1: Install the centering device 100 coaxially inside the central bore 2 of the rotor 1. The axis of the auxiliary projection 6 projected by the centering device 100 coincides with the axis of the rotor 1.

[0049] In practice, when the drive rod 114 is rotated counterclockwise, the four sliders 112 extend synchronously. The four sliders 112 abut against the central inner hole 2 of the rotor 1, thereby fixing the centering device 100 in the central inner hole 2.

[0050] Step 2: Calibrate the level of the centering device 100 so that the axis of the auxiliary projection 6 is perpendicular to the flange surface 5 at the top of the main shaft 4.

[0051] During implementation, the rotor 1 is in a horizontal state. By rotating the adjusting screw 122 at different positions and observing through the level 125, the level of the optical projection mechanism 130 is adjusted so that the axis of the auxiliary projection 6 coincides with the axis of the rotor 1, and the axis of the auxiliary projection 6 is perpendicular to the flange surface 5 at the top of the main shaft 4.

[0052] Step 3, Combining Figure 7 When the rotor 1 is reinstalled into the stator 3, the centering device 100 projects an auxiliary centering projection 6 onto the flange face 5, such as... Figure 8 As shown.

[0053] During implementation, the auxiliary projection 6 projected by the optical projection mechanism 130 is circular. When observing the auxiliary projection 6 at the position of the flange face 5, the inner hole of the flange face 5 or the bolt holes arranged around its circumference are used as the observation reference.

[0054] Step 4: Observe the position of the auxiliary projection 6 on the flange surface 5 to guide the attitude adjustment of rotor 1, so as to avoid rotor 1 colliding with stator 3.

[0055] During implementation, the offset of rotor 1 is determined by measuring or estimating the distance between the auxiliary projection 6 and the observation reference in multiple directions. Then, the position of rotor 1 on the plane is finely adjusted by the lifting equipment so that rotor 1 is aligned with the flange surface 5 at the top of the main shaft 4 and the rotor 1 is prevented from colliding with the stator 3.

[0056] Furthermore, it also includes the steps of acquiring the distance between the auxiliary projection 6 and the observation reference through the image acquisition device, and the steps of controlling the lifting equipment to make fine adjustments to its position.

[0057] During implementation, the image acquisition device can acquire the distances between the auxiliary projection 6 and the observation reference in multiple directions in real time, thereby determining the offset direction of the rotor 1. For example, if the distance value in one direction is greater than the other distance values, it means that the rotor 1 has shifted to that direction, and fine-tuning needs to be performed in the opposite direction until the distance values ​​in different directions are within the error range.

[0058] In use, the image acquisition device can be a camera. The camera sends the acquired image to the processing system. The processing system analyzes the auxiliary projection 6 and the observation benchmark in the image, obtains the distance value between the auxiliary projection 6 and the observation benchmark in different directions, and sends the data to the control system. The control system controls the trolley and carriage of the lifting equipment to make fine adjustments and moves.

[0059] Furthermore, as the rotor 1 falls, the centering device 100 adjusts the focal length of the auxiliary projection 6 according to the falling speed of the rotor 1, so that the auxiliary projection 6 is always located between the inner hole of the flange surface 5 and the bolt hole.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A large vertical hydro-generator rotor reinstallation and alignment device (100), characterized in that, It includes an alignment mechanism (110), a leveling mechanism (120), and an optical projection mechanism (130). The leveling mechanism (120) is installed in the lower middle part of the alignment mechanism (110), and the optical projection mechanism (130) is installed in the lower middle part of the leveling mechanism (120). The alignment mechanism (110) is used to install and fix it into the central body hole (2) of the rotor (1). The leveling mechanism (120) is used to adjust the level of the optical projection mechanism (130). The optical projection mechanism (130) is used to project an auxiliary centering projection (6) onto the flange face (5).

2. The large vertical hydro-generator rotor reinstallation and alignment device (100) according to claim 1, characterized in that, The alignment mechanism (110) includes a support base (111), a slider (112), a rotating disk (113), and a drive rod (114). The support base (111) is provided with at least three sliding grooves (1111) arranged radially and evenly in a ring. A slider (112) is installed in the sliding groove (1111). One end of the slider (112) is used to extend out of the sliding groove (1111) and support the inner hole (2) of the central body. A sliding column (1121) is fixed on the upper side of the other end. The center of the support base (111) is rotatably connected to the lower end of the drive rod (114). The rotating disk (113) is located on the upper side of the support base (111). The upper end of the drive rod (114) passes through the center hole of the rotating disk (113), and the drive rod (114) is fixedly connected to the rotating disk (113). A drive part (1141) is provided at the upper end of the drive rod (114). The rotating disk (113) has at least three spiral holes (1131) evenly distributed in a ring. The spiral holes (1131) correspond to the positions of the sliding pins (1121), and each sliding pin (1121) is inserted into each spiral hole (1131). When the rotating disk (113) is rotated by the drive rod (114), the sliders (112) are driven to extend and retract synchronously through the spiral holes (1131).

3. The large vertical hydro-generator rotor reinstallation and alignment device (100) according to claim 2, characterized in that, The support base (111) has a mounting ring (1112) fixed at the bottom center. Multiple fan-shaped blocks (115) are installed inside the mounting ring (1112). The multiple fan-shaped blocks (115) are arranged to form a disc structure. The center of the disc structure has a conical hole (1151) that is smaller at the top and larger at the bottom. The axial center of the drive rod (114) is provided with a through hole. A locking screw (116) is installed in the through hole. The lower end of the locking screw (116) is provided with a cone (1161) that is adapted to the cone (1151). The cone (1161) is located inside the cone (1151). After the upper end of the locking screw (116) extends out of the drive rod (114), a locking nut (1162) is screwed on.

4. The large vertical hydro-generator rotor reinstallation and alignment device (100) according to claim 2, characterized in that, The lower end of the drive rod (114) is provided with a flange (1142), and the bottom of the central hole of the support base (111) is provided with an annular groove. The drive rod (114) passes through the central hole of the support base (111) from bottom to top, and the flange (1142) is located in the annular groove.

5. The large vertical hydro-generator rotor reinstallation and alignment device (100) according to claim 1, characterized in that, The leveling mechanism (120) includes a connecting seat (121), the top of which is provided with a threaded countersunk hole (1211), and the bottom of the alignment mechanism (110) has a mounting ring (1112). The outer circumference of the mounting ring (1112) is provided with an external thread, and the threaded countersunk hole (1211) is screwed and fixed to the mounting ring (1112). At least three adjusting screws (122) are evenly distributed in a ring at the bottom of the connecting seat (121) and installed through a ball joint structure. The lower end of the rod (122) is screwed into the adjusting seat (123) with thread; the bottom of the adjusting seat (123) is connected to the base (124) through the connecting rod, the upper side of the base (124) is equipped with a level (125), the lower side of the base (124) is provided with a connecting screw (1241), the top of the optical projection mechanism (130) is provided with a threaded hole (131), and the optical projection mechanism (130) is installed and fixed with the connecting screw (1241) through the threaded hole (131).

6. The large vertical hydro-generator rotor reinstallation and alignment device (100) according to claim 1, characterized in that, At least one image acquisition device (132) is mounted on the bottom of the optical projection mechanism (130).

7. A method for reinstalling and aligning the rotor of a large vertical hydro-generator, characterized in that, The method employs the centering apparatus (100) according to any one of claims 1 to 6, and includes the following steps: Step 1: Install a centering device (100) coaxially inside the central bore (2) of the rotor (1). The axis of the auxiliary projection (6) projected by the centering device (100) coincides with the axis of the rotor (1). Step 2: Calibrate the level of the centering device (100) so that the axis of the auxiliary projection (6) is perpendicular to the flange face (5) at the top of the main shaft (4); Step 3: When reinstalling the rotor (1) into the stator (3), centering auxiliary projection (6) is projected onto the flange face (5) through the centering device (100); Step 4: Observe the position of the auxiliary projection (6) on the flange face (5) to guide the rotor (1) attitude adjustment to avoid the rotor (1) colliding with the stator (3).

8. The method for reinstalling and aligning the rotor of a large vertical hydro-generator according to claim 7, characterized in that, The auxiliary projection (6) is circular; when observing the position of the auxiliary projection (6) on the flange face (5), the inner hole of the flange face (5) or the bolt holes arranged around the circumference are used as the observation reference.

9. The method for reinstalling and aligning the rotor of a large vertical hydro-generator according to claim 8, characterized in that, It also includes the steps of obtaining the distance between the auxiliary projection (6) and the observation reference through the image acquisition device, and the steps of controlling the lifting equipment to make fine adjustments to its position.

10. The method for reinstalling and aligning the rotor of a large vertical hydro-generator according to claim 7, 8, or 9, characterized in that, When the rotor (1) is falling, the centering device (100) adjusts the focal length of the auxiliary projection (6) according to the falling speed of the rotor (1) so that the auxiliary projection (6) is always located between the inner hole and the bolt hole of the flange face (5).

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