Hydro-generator stator positioning rib installation method

Abstract

The invention discloses a hydro-generator stator positioning rib mounting method, which comprises the following steps of: arranging a supporting plate on a positioning rib, placing the positioning rib on a stator base, selecting a reference positioning rib for adjustment, and pre-adjusting other positioning ribs after the reference positioning rib is adjusted to be qualified, simulation laminations are respectively installed on an annular plate of a stator base, the simulation laminations are formed by stacking a plurality of punching sheets in the anticlockwise direction, the punching sheet located on the upper layer advances by a positioning rib in the anticlockwise direction relative to the punching sheet located on the lower layer, the perpendicularity and concentricity between stator grooves of the simulation laminations are checked, and the simulation laminations are adjusted and corrected. And after the inspection meets the requirement, the positioning rib and the supporting plate are welded and fixed. Therefore, the positioning rib is positioned and adjusted by adopting the simulation lamination, and the problems that the radius, the indexing, the perpendicularity and the chord length of stator positioning rib installation of a large hydropower station are not easy to adjust at the same time, and the installation size of the positioning rib is influenced by environment temperature change to cause measurement deviation are solved.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower generation, and in particular to a method for installing positioning ribs of a stator of a hydro-generator. Background Art

[0002] The positioning ribs of the hydro-turbine generator stator are key components for fixing the stator core. Their main function is to ensure that the stator core maintains the correct position during the operation of the unit and prevent displacement caused by vibration or thermal expansion and contraction. In the related art, the installation of the positioning ribs of the hydropower station generator stator adopts a method of repeatedly measuring and adjusting each positioning rib one by one with absolute dimensions. This method has high technical requirements, large adjustment workload, long installation period, and is prone to rework that affects the construction period. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] In the related technology, since the number of stator locating ribs of large hydropower stations is large and long, 80 to 200 locating ribs need to be installed. At the same time, the technical requirements are high. The radius, division, verticality, chord length and other dimensions are required to be controlled to an error level of 0.05mm. The adjustment process requires multiple measurements, calibrations, adjustments and corrections of the absolute dimensions of each locating rib. If one of the locating ribs is wrong, the surrounding locating ribs need to be readjusted. The installation of the locating ribs takes a long time and requires a lot of work.

[0005] The relevant technologies require the use of a large number of complex special tools and the installation procedures and processes are complicated, which requires high quality of personnel.

[0006] In the related technology, it is very easy to be affected by the temperature difference between the front and back of the environment, the error of tools and tools, and the manual skills. The adjustment process is prone to errors, the installation accuracy is prone to fluctuations, and the installation efficiency is low.

[0007] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0008] To this end, an embodiment of the present invention proposes a method for installing stator locating ribs of a hydro-turbine generator, which solves the problem that the radius, division, verticality and chord length of the stator locating ribs of a large hydropower station are difficult to adjust at the same time, and the installation dimensions of the locating ribs are affected by changes in ambient temperature, resulting in measurement deviations.

[0009] The method for installing the stator positioning ribs of a hydro-turbine generator according to the embodiment of the present invention comprises:

[0010] Arrange multiple supporting plates at intervals on each positioning rib and along the length direction thereof, place the multiple positioning ribs at corresponding installation positions on the stator frame of the hydro-generator, and temporarily fix the positioning ribs and the supporting plates;

[0011] Select a reference locating rib from multiple locating ribs, and repeatedly adjust the reference locating rib to make its size deviation meet the preset value;

[0012] After the reference positioning rib is adjusted to the required standard, other positioning ribs are pre-adjusted in sequence according to the preset chord distance;

[0013] Simulated laminations are respectively installed on the lower ring plate, the middle ring plate and the upper ring plate of the stator frame. The simulated laminations are made by stacking a plurality of punching sheets in a counterclockwise direction, and the punching sheets on the upper layer are advanced by a positioning rib in the counterclockwise direction relative to the punching sheets on the lower layer.

[0014] Check the verticality between the stator slots of the simulated laminations on each ring plate of the stator frame, as well as the concentricity between the simulated laminations on each ring plate, and adjust and correct them so that the detection value does not exceed the preset value;

[0015] After the simulated lamination inspection meets the requirements, weld and fix the positioning ribs and support plates.

[0016] The method for installing the stator positioning ribs of a hydro-turbine generator in the embodiment of the present invention adopts simulated laminations to position and adjust the positioning ribs, which solves the problem that the radius, division, verticality, chord length and other dimensions of multiple positioning ribs are difficult to adjust at the same time, as well as the problem of the influence of the front and rear temperature difference on the dimensions. The use of simulated laminations to position and adjust the positioning ribs does not require a large number of complex special tools, and the installation process and process are relatively simple. The use of simulated laminations to position and adjust the positioning ribs allows for overall control with reference to the positioning standard, is not prone to deviations, and the installation accuracy is easy to control, greatly improving the installation efficiency.

[0017] In some embodiments, a plurality of support plates are placed on respective ring plates of the stator frame respectively, and when the support plates are placed, the paint on the positions where the support plates are placed on the ring plates is polished.

[0018] In some embodiments, a center line is drawn at the position where the locating ribs of the lower ring plate of the stator base are placed, and each position is numbered. When the locating ribs are placed on the stator base, the center line of the locating ribs is adjusted to match the position of the center line drawn on the lower ring plate.

[0019] In some embodiments, positioning rib No. 1 is selected as the reference positioning rib, and the radial and circumferential verticality deviations of positioning rib No. 1 are adjusted to be less than 0.05 mm / m. The inner radius of positioning rib No. 1 at each support plate is measured using a central circle measuring frame, and the absolute size deviation of the radius is -0.05 mm to -0.025 mm. The radial torsion radius deviation of positioning rib No. 1 is adjusted to be less than 0.10 mm.

[0020] In some embodiments, a C-shaped clamp is used to temporarily fix the positioning rib and the upper ring plate of the stator frame, and a wedge-shaped plate is driven between the positioning rib and the support plate to temporarily fix the two.

[0021] In some embodiments, after the No. 1 locating rib is adjusted to be qualified, the other locating ribs are pre-adjusted using a jack and a chord distance template.

[0022] In some embodiments, the thickness of the simulated lamination is 20 mm to 30 mm, and each punch of the simulated lamination is shaped and positioned using a groove sample rod and a guide pin, and each punch is pressed after the shaping is completed.

[0023] In some embodiments, a plumb bob method is used to check the verticality between stator slots of simulated laminations on each ring plate of the stator frame so that the verticality is less than 0.1 mm, and the verticality of at least two stator slots is checked for each punching sheet.

[0024] In some embodiments, a roundness tester is used to check the inner diameter and roundness of the core of the simulated laminations, and roundness correction is performed, with the maximum allowable deviation not exceeding ±1% of the air gap.

[0025] In some embodiments, during the correction adjustment process, the C-clamp can be loosened, the position of the support plate can be moved to adjust the positioning ribs, and the wedge plate can be kept between the positioning ribs and the support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the preliminary installation of the positioning ribs according to an embodiment of the present invention.

[0027] Figure 2 Schematic diagram of the reference positioning rib according to an embodiment of the present invention.

[0028] Figure 3 Schematic diagram of simulated lamination according to an embodiment of the present invention.

[0029] Figure 4 Schematic diagram of a special support tool according to an embodiment of the present invention.

[0030] Figure 5 Schematic diagram of simulated lamination measurement adjustment according to an embodiment of the present invention.

[0031] Figure 6 It is a first schematic diagram of welding the support plate and the ring plate according to an embodiment of the present invention.

[0032] Figure 7 This is a second schematic diagram of the welding of the support plate and the ring plate according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] 1- stator base, 2-positioning ribs, 21-C-type clamps, 22-reference positioning ribs, 3-support plates, 31-top columns, 4-simulated laminations, 41-lower simulated laminations, 42-middle simulated laminations, 43-upper simulated laminations, 5-special supporting tools, 51-support frame, 52-support plate, 53-positioning pins, 6-circular measuring frame. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0036] The following describes a method for installing the stator positioning ribs of a hydro-generator according to an embodiment of the present invention in conjunction with the accompanying drawings.

[0037] like Figures 1 to 7 As shown, the method for installing the stator locating ribs of a hydro-turbine generator according to an embodiment of the present invention comprises: preliminary installation of the locating ribs 2 → installation of the reference locating ribs 22 → pre-installation of other locating ribs 2 → installation of simulated laminations 4 on the lower ring plate → installation of simulated laminations 4 on the middle ring plate → installation of simulated laminations 4 on the upper ring plate → welding of the locating ribs 2 and the support plate 3.

[0038] Step 1: Initial installation of positioning rib 2, such as Figure 1 shown.

[0039] s1: Grind off the paint on the position where the pallet 3 is placed on the pallet 3 and the ring plate. The paint between the pallet 3 and the ring plate may affect the contact quality between them. Grinding off the paint can ensure that the contact surface between the two parts is cleaner and prevent the paint layer from affecting the flatness and friction coefficient of the contact surface. Grinding off the paint can prevent the paint layer from causing subsequent positioning errors of the positioning rib 2, thereby meeting the accuracy requirements of the installation. If the paint is not cleaned, it may affect the bonding strength between the high-strength adhesive or welding material and the metal surface, thereby affecting the fixing effect of the positioning rib 2.

[0040] s2: Use a marking needle to mark the center line of the positioning rib 2 on the lower ring plate of the stator frame 1 according to the design drawing, and number them from 1 to N using steel code.

[0041] Among them, the center line is the reference for the installation of the positioning rib 2. By marking the line, the precise position of the positioning rib 2 in space can be ensured, providing intuitive installation guidance for the installers, helping the staff to operate according to the established position, improving installation efficiency, reducing installation errors, and facilitating preliminary quality control.

[0042] In addition, the numbering can help construction workers quickly identify the position of each positioning bar 2, which is particularly important when installing a large number of positioning bars 2. Through the numbering, the staff can accurately know the installation order and specific position of each positioning bar 2, further improving the installation efficiency.

[0043] s3: The number of support plates 3 installed on each positioning rib 2 corresponds to the number of ring plates of the stator base 1 from bottom to top, and multiple support plates 3 are arranged on the positioning rib 2 at intervals along the length direction of the positioning rib 2. The multiple positioning ribs 2 are placed in the corresponding installation positions on the stator base 1 respectively, and the multiple support plates 3 on each positioning rib 2 are placed on the corresponding ring plates of the stator base 1 respectively.

[0044] s4: Adjust the positions of the positioning rib 2 and the support plate 3. When the center line of the positioning rib 2 coincides with the center line marked on the lower ring plate, use a C-clamp to temporarily fix the upper end of the positioning rib 2 to the upper ring plate of the stator base 1, set a top column 31 between two adjacent support plates 3 to temporarily fix the support plate 3, and lightly drive a wedge plate between the positioning rib 2 and the support plate 3 to wedge the two for temporary fixation.

[0045] It is understandable that temporary fixation can ensure that the positioning ribs 2 and the support plate 3 will not shift after the initial installation, thereby maintaining the accuracy of the installation position and meeting the high-precision standards required by the design. In the subsequent operation process, after the positioning ribs 2 and the support plate 3 are temporarily fixed, the installer can make minor adjustments to them until the ideal installation position and state are reached, and then perform the final fixation.

[0046] Step 2: Install the reference positioning rib 22. Figure 2 shown.

[0047] s1: Select positioning rib No. 1 from multiple positioning ribs 2 as the reference positioning rib 22 (+Y direction positioning rib 2).

[0048] In engineering practice, parts are usually numbered, with 1 as the starting number for ease of identification. Selecting 1 as the reference helps standardize the installation process and make the installation work more standardized.

[0049] In a three-dimensional coordinate system, a reference point or reference direction is usually required to establish a coordinate system. Selecting the No. 1 positioning rib in the +Y direction as the reference can easily establish the installation coordinate system of the subsequent positioning ribs 2, which helps to ensure that all positioning ribs 2 are installed in the correct spatial position.

[0050] s2: Repeatedly adjust the reference positioning rib 22 so that its dimensional deviation meets the preset value.

[0051] Optionally, the following requirements must be met: the radial and circumferential verticality deviations of the positioning rib 2 are no more than 0.05 mm / m; the inner radius of the positioning rib 2 at each support plate 3 is measured by a central circle measuring frame 6, and the deviation of the absolute radius D is -0.05 mm to -0.025 mm; the radial torsion radius A, B deviation of the positioning rib 2 is no more than 0.10 mm.

[0052] Step three: pre-install other positioning ribs 2.

[0053] After the reference positioning rib 22 is adjusted to be qualified, the initially installed positioning rib 2 is adjusted and pre-installed with the help of the special adjustment jack and chord distance template provided by the manufacturer.

[0054] It can be understood that the special adjustment jack and chord spacing template are tools specially designed for the installation of the locating ribs 2. They can help the installers to accurately adjust the position and spacing of the locating ribs 2, improve the installation efficiency, ensure that the size and tolerance requirements of the design drawings are met, and ensure that all locating ribs 2 are installed consistently, which is essential to maintaining the uniformity and stability of the entire stator structure.

[0055] Pre-installation adjustment of other positioning ribs 2 can ensure that the positioning ribs 2 have reached a stable state before they are formally fixed, and possible problems can be discovered and solved in time before the positioning ribs 2 are formally welded or fixed, thereby reducing the possibility of rework.

[0056] Step 4: Install the simulated lamination 4 on the lower ring plate, as shown in Figures 3 to 5 shown.

[0057] It should be noted that the simulated lamination 4 can use ordinary punching sheets supplied by the manufacturer, and multiple machines can share a set to improve its reusability. The thickness of the simulated lamination 4 is 20mm to 30mm. The simulated lamination 4 is made by stacking multiple punching sheets, and the number of layers of the punching sheets is 30 to 60. In addition, for the convenience of description, the simulated lamination 4 installed on the lower ring plate is called the lower simulated lamination 41, the simulated lamination 4 installed on the middle ring plate is called the middle simulated lamination 42, and the simulated lamination 4 installed on the upper ring plate is called the upper simulated lamination 43.

[0058] s1: The lower simulated laminations 41 start directly from the +Y direction marked on the stator frame 1, and are laminated in a counterclockwise direction, with the upper layer of laminations moving forward in a counterclockwise direction relative to the lower layer of laminations by a positioning rib 2. In other words, from a three-dimensional perspective, the simulated laminations 4 resemble a spiral staircase.

[0059] It is understandable that the design of the stacking method of the simulated laminations 4 makes the adjustment of the positioning ribs 2 more intuitive and simple. By adjusting the simulated laminations 4, multiple positioning ribs 2 can be adjusted synchronously, which helps the installer to maintain consistency and accuracy when adjusting the positioning ribs 2. In addition, during the installation process, due to factors such as manufacturing tolerances and site conditions, spatial changes may occur. The spiral staircase-like design helps the positioning ribs 2 to be flexibly adjusted in space to adapt to these changes.

[0060] s2: The simulated lamination 4 is shaped and positioned using slot sample bars and guide pins to ensure that the lamination is arranged evenly in the stator slots to avoid warping or deformation.

[0061] s3: After the shaping is completed, use the lamination tool to compact each punching sheet, and each punching sheet should be compacted at least at two locations. Compressing the punching sheets can enhance the overall mechanical strength of the stator, improve its ability to resist vibration and impact, effectively prevent the laminations from loosening, and facilitate the installation of the positioning rib 2 and other electrical components.

[0062] Optionally, the lamination tool is usually designed as a hand tool or an electric tool, which is used to accurately install the laminations to the corresponding positions of the stator. It may include one or more parts, such as a handle, a guide rod, a clamping device, and a fixing clamp.

[0063] s4: Use the roundness measuring stand 6 to check the inner diameter and roundness of the core of the simulated lamination 4, and make roundness corrections. The maximum allowable deviation shall not exceed ±1% of the air gap.

[0064] s5: Check whether the positions of the stator slots and the pressing fingers of the simulated lamination 4 are consistent, and check the concentricity of the through-screw holes on the punching sheet and the holes on the pressure plate.

[0065] If the inspection results in the above steps s4 and s5 exceed the preset values, adjustments must be made by loosening the C-type clamp 21 and moving the support plate 3 to adjust the positioning rib 2. At this time, the wedge plate between the positioning rib 2 and the support plate 3 should always be kept between the two to ensure the effectiveness of the adjustment.

[0066] Step 5: Install the simulated lamination 4 in the middle ring plate, such as Figures 3 to 5 shown.

[0067] s1: Bolt the special support tool 5 onto the middle ring plate of the stator frame 1, and level the support plate 52 of the middle simulated lamination 42. The remaining steps are the same as the stacking method of the lower simulated lamination 41.

[0068] Optionally, the main function of the special support tool 5 is to provide support during the installation of the laminations to prevent the laminations from being deformed or shifted due to their own weight or external forces. These tools usually have a precise positioning function to ensure that the laminations can be accurately installed in the correct position of the stator frame 1. Tool types include, for example, a support frame 51 and a support plate 52, which are used to support the laminations and keep them in position; and a positioning pin 53, which is used to fix the support frame 51 on the ring plate of the stator frame 1.

[0069] s2: Use the method of hanging a plumb bob to check the verticality of the stator slots of the middle simulated lamination 42 and the lower simulated lamination 41. An opening is provided on the support plate 52 of the special support tool 5 to allow the plumb bob to pass through. The verticality is ≤0.1mm. Check the verticality of the slot shape at least at two locations for each punching sheet.

[0070] s3: Use the roundness measuring frame 6 to check the inner diameter and roundness of the middle simulated lamination 42, as well as the concentricity with the lower simulated lamination 41, and make roundness corrections. The maximum allowable deviation does not exceed ±1% of the air gap.

[0071] Similarly, if the inspection results in the above steps s2 and s3 exceed the preset values, adjustments must be made by loosening the C-type clamp 21 and moving the pallet 3 to adjust the positioning rib 2. In addition, all dimensional inspections and the position inspection of the positioning rib 2 should be recorded accordingly.

[0072] Step 6: Install the simulated lamination 4 on the upper ring plate, as shown in Figures 3 to 5 shown.

[0073] s1: Bolt the special support tool 5 onto the upper ring plate of the stator frame 1, and level the support plate 52 of the upper simulated lamination 43. The remaining steps are the same as the stacking method of the lower simulated lamination 41.

[0074] s2: Use the method of hanging a plumb bob to check the verticality of the stator slots of the upper simulated lamination 43, the middle simulated lamination 42 and the lower simulated lamination 41. An opening is provided on the support plate 52 of the special support tool 5 to allow the plumb bob to pass through. The verticality is ≤0.1mm. Check the verticality of the slot shape at least at two locations for each punching sheet.

[0075] s3: Use the roundness measuring frame 6 to check the inner diameter and roundness of the upper simulated lamination 43, as well as the concentricity between the middle simulated lamination 42 and the lower simulated lamination 41, and make roundness corrections. The maximum allowable deviation does not exceed ±1% of the air gap.

[0076] Similarly, if the inspection results in the above steps s2 and s3 exceed the preset values, adjustments must be made by loosening the C-type clamp 21 and moving the pallet 3 to adjust the positioning rib 2. In addition, all dimensional inspections and the position inspection of the positioning rib 2 should be recorded accordingly.

[0077] Step 7: Weld the positioning rib 2 and the support plate 3. Figure 6 and Figure 7 shown.

[0078] After the upper simulated laminations 43, the middle simulated laminations 42 and the lower simulated laminations 41 are installed, and the sizes of the simulated laminations 4 and the positioning ribs 2 are checked and found to meet the requirements, the positioning ribs 2 and the support plates 3 are welded and fixed, thereby completing the overall installation of the stator positioning ribs 2 of the hydro-generator.

[0079] It can be understood that the method for installing the stator locating ribs of a hydro-turbine generator according to the embodiment of the present invention adopts a technology that, in the installation of the locating ribs 2, instead of starting with the individual absolute size adjustment of each locating rib 2 among hundreds of locating ribs 2, the "simulated laminations 4" are installed as a reference for the positioning standard to adjust the locating ribs 2 as a whole, and the size of each locating rib 2 is controlled by adjusting the size of the "simulated laminations 4". Once the overall size of the "simulated laminations 4" is adjusted, the size of each locating rib 2 is also adjusted.

[0080] Therefore, the positioning rib 2 is positioned and adjusted by using the simulated lamination 4 method as a reference positioning standard, avoiding the workload of measuring and adjusting each positioning rib 2 one by one with absolute dimensions and repeating the calibration and adjustment back and forth in the related technology. The risk of errors such as insufficient installation accuracy, error accumulation, and the influence of ambient temperature difference on installation dimensions in the related technology is eliminated.

[0081] The simulated laminations 4 play a good role in fixing and supporting the positioning ribs 2, and can effectively control and prevent the positioning ribs 2 and the support plate 3 from being deformed during the welding process.

[0082] Compared with the related technologies, the method of simulating lamination 4 to locate and adjust the positioning rib 2 simplifies the installation process and technology, and greatly improves the efficiency and quality of stator assembly operations.

[0083] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0087] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0088] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A method for installing the stator positioning ribs of a hydro-generator, characterized in that: include: Arrange multiple supporting plates at intervals on each positioning rib and along the length direction thereof, place the multiple positioning ribs at corresponding installation positions on the stator frame of the hydro-generator, and temporarily fix the positioning ribs and the supporting plates; Select a reference locating rib from multiple locating ribs, and repeatedly adjust the reference locating rib to make its size deviation meet the preset value; After the reference positioning rib is adjusted to the required standard, other positioning ribs are pre-adjusted in sequence according to the preset chord distance; Simulated laminations are respectively installed on the lower ring plate, the middle ring plate and the upper ring plate of the stator frame. The simulated laminations are made by stacking a plurality of punching sheets in a counterclockwise direction, and the punching sheets on the upper layer are advanced by a positioning rib in the counterclockwise direction relative to the punching sheets on the lower layer. Check the verticality between the stator slots of the simulated laminations on each ring plate of the stator frame, as well as the concentricity between the simulated laminations on each ring plate, and adjust and correct them so that the detection value does not exceed the preset value; After the simulated lamination inspection meets the requirements, weld and fix the positioning ribs and support plates.

2. The method for installing the stator positioning ribs of a hydro-generator according to claim 1, characterized in that: The plurality of support plates are respectively placed on the respective ring plates of the stator frame, and when the support plates are placed, the paint on the positions where the support plates are placed on the support plates and the ring plates is polished.

3. The method for installing the stator positioning ribs of a hydro-generator according to claim 1, characterized in that: A center line is drawn at the position where the locating rib of the lower ring plate of the stator base is placed, and each position is numbered. When the locating rib is placed on the stator base, the center line of the locating rib is adjusted to coincide with the position of the center line drawn on the lower ring plate.

4. The method for installing the stator positioning ribs of a hydro-generator according to claim 3, characterized in that: Select No. 1 positioning rib as the reference positioning rib, adjust the radial and circumferential verticality deviations of No. 1 positioning rib to be less than 0.05mm / m, use the central circle measuring frame to measure the inner radius of No. 1 positioning rib at each support plate, the absolute radius deviation is -0.05mm to -0.025mm, and adjust the radial torsion radius deviation of No. 1 positioning rib to be less than 0.10mm.

5. The method for installing the stator positioning ribs of a hydro-generator according to claim 3, characterized in that: The positioning rib and the upper ring plate of the stator frame are temporarily fixed by a C-type clamp, and a wedge plate is driven between the positioning rib and the support plate to temporarily fix the two.

6. The method for installing the stator positioning ribs of a hydro-generator according to claim 4, characterized in that: After the No. 1 locating bar is adjusted to standard, use the jack and chord distance template to pre-adjust the other locating bars.

7. The method for installing the stator positioning ribs of a hydro-generator according to claim 5, characterized in that: The thickness of the simulated lamination is 20 mm to 30 mm. Each punch of the simulated lamination is shaped and positioned using a groove sample rod and a guide pin. After the shaping is completed, each punch is pressed.

8. The method for installing the stator positioning ribs of a hydro-generator according to claim 7, characterized in that: The verticality between the stator slots of the simulated laminations on each ring plate of the stator frame is checked by hanging a plumb bob so that the verticality is less than 0.1 mm, and the verticality of at least two stator slots is checked for each punching.

9. The method for installing the stator positioning ribs of a hydro-generator according to claim 8, characterized in that: Use a roundness measuring stand to check the inner diameter and roundness of the simulated lamination core, and make roundness corrections. The maximum allowable deviation shall not exceed ±1% air gap.

10. The method for installing the stator positioning ribs of a hydro-generator according to claim 9, characterized in that: During the correction and adjustment process, the C-clamp can be loosened, the position of the support plate can be moved to adjust the positioning ribs, and the wedge plate can be kept always between the positioning ribs and the support plate.

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