Method for mounting inner and outer stators in a half-split machine

Abstract

The application discloses a half machine seat inner and outer stator mounting method, and relates to the technical field of generators, and comprises the following steps: preliminarily leveling and fixing a lower half machine seat; hoisting an inner stator into the lower half machine seat and independently supporting and heightening the inner stator through an adjustable base operated from a bottom operation hole of the lower half machine seat, and then circumferentially locking the inner stator through a fixed support; arranging a jack at both ends and both sides of the lower half machine seat, respectively adjusting axial and radial positions of the jack, and until an axial center line and a central vertical plane of the lower half machine seat completely coincide with corresponding references of the inner stator; installing a spring plate after centering, and finally assembling an upper half machine seat. The application effectively protects key components such as an inner stator core and winding from being damaged in the mounting process, and improves assembly precision.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and more specifically to a method for installing the inner and outer stators of a split-frame. Background Technology

[0002] For large generators with inner and outer stator structures, the traditional installation method often uses an integral outer frame. The inner stator is usually connected to the integral outer frame through a tangential spring plate, and the inner stator is positioned and installed by sliding it horizontally or vertically into the outer frame with the help of a slider, sliding plate structure or hoisting. However, the operation is complicated and there is a risk that the heavy inner stator is difficult to position and is prone to torsion or collision damage during the installation process.

[0003] Chinese patent document CN102364833A, published on February 29, 2012, discloses a method for installing the inner and outer stators of a large generator. The steps are as follows: the outer stator is placed horizontally and fixed; the inner stator is slowly pulled horizontally to slide into the outer stator; after the inner stator is installed, it is lifted to the required assembly position using a jack; finally, the spring plate on the inner stator is welded and fixed to the corresponding support structure of the outer stator to complete the entire installation process. The installation method provided by this invention is not limited by the maximum weight capacity of the installation tools, the special tools used in the installation are simple, there is no need to adjust the circumference or concentricity of the inner and outer stators during the installation, the installation process is simple, and the entire stator does not need to be turned over after installation.

[0004] However, the above technical solution involves installing guide rails on the inner and outer stators, pulling steel wire ropes to thread the inner and outer stators into place, and then using jacks to adjust the position of the inner stator to complete the installation. During the connection of the inner and outer stators, the inner stator is easily damaged by bumps, especially when the weight of the inner stator of a large thermal generator is much greater than that of the outer stator. When the inner stator is pulled into the outer stator, even a slight deviation in the guide rail can damage the inner stator.

[0005] Chinese patent document CN116014997A, published on April 25, 2023, discloses an inner and outer stator installation structure and method applicable to distributed synchronous condensers. The installation method includes the following steps: Step 1: First, position the inner stator on two arc-shaped pads on a C-frame, with the theoretical middle part of the inner stator located at the exact center of the two arc-shaped pads; Step 2: Using the side end face of the C-frame column as a reference, record the relative position of the inner stator and the reference reference, thereby deriving the relative position of the outer stator and the reference reference; Step 3: Install the axial positioning mechanism on the C-frame column; Step 4: Using a crane control, fit the outer stator onto the inner stator and axially hoist the outer stator to a position beyond the set position of the inner stator; Step 5: Using the hydraulic jack of the axial positioning mechanism, axially push the outer stator back to the set position; if the hydraulic jack's stroke is insufficient, use its axial adjustment block to compensate for the axial stroke.

[0006] However, the above-mentioned technical solution has two problems. First, its specific installation structure is not suitable for large thermal generators with heavy inner stators. The load-bearing design and structural strength of the C-frame are designed for light and small synchronous condensers. If the generator's inner stator is heavy and sits on the two arc-shaped pads on the C-frame, the C-frame will deform under pressure. The middle part of the inner stator will be located in the middle of the two arc-shaped pads, and the middle part and both ends of the inner stator will sag due to gravity, and the center line will become arc-shaped. This poses a safety hazard when used for heavy inner stators, and there is a risk that the center line of the inner stator will not be straight and the accuracy will be compromised after being supported by the C-frame. Second, it only matches the axial center lines of the inner and outer stators through the axial positioning mechanism. In the initial crane hoisting steps, there is a tendency for axial deviation to occur, which will lead to uneven stress on each spring plate after installation. Furthermore, after the outer stator is hoisted, the spring plate installation space is small and the operation is difficult, which will affect the installation quality of the spring plates. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention proposes a method for installing the inner and outer stators of a split-frame generator. Using the inner stator as a fixed reference, precise alignment between the two is achieved by adjusting the position of the outer frame (mainly the lower half of the frame). Since the weight of the inner stator in a large thermal generator is significantly greater than that of the outer frame, this method avoids the difficulties and risks associated with moving and adjusting the heavy inner stator, effectively protecting key components such as the inner stator core and windings from damage during installation, and improving assembly accuracy.

[0008] This invention is achieved using the following technical solution: A method for installing the inner and outer stators of a split-frame includes the following steps: S1. Initially fix the lower half of the machine base onto the installation platform using the support box, and adjust the height of the lower half of the machine base to a horizontal position; S2. Multiple independent adjustable bases are set below the lower half of the machine base. The bottom of the lower half of the machine base has an operation hole at the position corresponding to the adjustable base. The multiple adjustable bases are placed on the installation platform and adjusted to be horizontal. The inner stator is hoisted into the lower half of the machine base and placed on the adjustable base. The inner stator is found to the horizontal center through the adjustable base. This horizontal center is at the same height as the horizontal center of the lower half of the machine base. S3. Four fixed brackets are symmetrically arranged on both sides of the lower half of the base. One end of each fixed bracket is fixed to the mounting platform, and the other end is symmetrically fixed to the inner stator by bolts, so as to ensure that the inner stator is reliably fixed and will not flip. S4. Multiple jacks are symmetrically arranged on both ends and sides of the lower half of the machine base. The horizontal axial position of the lower half of the machine base is adjusted by the jacks on the end faces, and the horizontal lateral position of the lower half of the machine base is adjusted by the jacks on the sides. While keeping the position of the inner stator unchanged, the relative dimensions of the axial center of the inner stator core and the inner circle reference surface of the lower half of the machine base are found by a collimator. The axial center line of the lower half of the machine base is finely adjusted until it coincides with the axial center line of the inner stator. The dimensions of the end face of the inner stator core and the reference end face of the lower half of the machine base are measured, and the central vertical plane of the lower half of the machine base is made coplanar with the central vertical plane of the inner stator. S5. After the inner stator and the lower half of the frame are aligned, the lower half of the frame is fixedly supported, and a spring plate is installed from the split surface of the lower half of the frame. The inner stator and the lower half of the frame are connected by double-sided welding of the spring plate. S6. Install the upper half of the machine base. After assembling the upper and lower half of the machine base, lift the machine base vertically, remove the support base, and seal the operating hole of the lower half of the machine base with a manhole cover.

[0009] In step S6, before installing the upper half of the machine base, at least two sets of symmetrical guide positioning pins along the axis are installed at the split surface of the lower half of the machine base. The lower end of the guide positioning pin is positioned and engaged with the pin hole on the support box, and the upper end is provided with a guide section with a length of not less than 100mm.

[0010] In S6, the upper half of the machine base is installed by four-point horizontal lifting, and the horizontal deviation of the split surface is monitored in real time and kept less than 0.03mm / m. The upper and lower half of the machine base are slowly lowered along the guide positioning pin to complete the assembly of the upper and lower half of the machine base. During the assembly process, the feeler gauge is used to check the joint gap of the split surface throughout the process to ensure that the overall joint gap of the split surface after the upper and lower half of the machine base is assembled is not greater than 0.05mm.

[0011] The engagement points of the four fixed supports and the inner stator are at the same height in space.

[0012] A protective pad for protecting the inner stator is placed between the top surface of the adjustable base and the inner stator housing.

[0013] In step S1, the lower half of the machine base is adjusted to a horizontal state with the assistance of a level.

[0014] In step S1, multiple sets of support boxes symmetrically arranged on the installation platform are used to support the middle support edge of the lower half of the machine base on the top surface of the support box, thereby achieving the initial fixation of the lower half of the machine base on the installation platform.

[0015] The support box and the installation platform are fixed with bolts. The upper surface of the support box and the lower half of the base plate are both precision machined to reduce the friction between them. The adjustable base is pre-arranged on the projection of the lower half of the base axis.

[0016] At least two adjustable bases are provided, projected along the axis of the lower half of the base.

[0017] Compared with the prior art, the advantages of the present invention are as follows: 1. This invention uses the inner stator as a stationary reference component, supported by an independent base. After the axial center height of the inner stator is aligned with the axial center height of the lower half of the base, a fixed bracket connected to the installation platform forms a symmetrical fixation, preventing the inner stator from twisting during the entire installation process. This completely eliminates the risk of overturning and collision caused by repeated lifting and fine-tuning of the overweight inner stator in traditional processes, effectively protecting the inner stator from damage. At the same time, the protective pad between the top surface of the adjustable base and the inner stator shell provides direct physical isolation, further avoiding stress concentration and surface scratches at the support points.

[0018] 2. In this invention, the installation of the spring plates is performed from the split surface of the lower half of the machine base, providing sufficient operating space for critical operations such as gap checks and bolt tightening. The double-sided welding method for the spring plates improves welding quality, ensures uniform stress on the weld, and reduces the likelihood of welding deformation. During the welding process, the inner stator is consistently and uniformly supported axially by the adjustable base, ensuring that the spring plates are not affected by the weight of the inner stator during welding. This avoids the adverse effects of the inner stator's own weight on the welding quality of the spring plates, thus ensuring uniform stress on each spring plate during operation and improving the overall reliability of the machine.

[0019] 3. This invention, after aligning the inner stator height using an independent adjustable base, fixes the inner stator as an absolute reference before adjusting the lower frame. Jacks are placed at both ends of the lower frame for horizontal axial adjustment, and jacks are placed on both sides for horizontal radial adjustment, decoupling the adjustment forces in the two directions. This makes the operation intuitive and prevents interference. Combined with a collimator for precise measurement of the axial center of the inner stator core and the inner circular reference plane of the lower frame, the results of each fine-tuning step can be accurately predicted and verified, ensuring extremely high alignment accuracy. This design avoids the repeated heavy-duty inner stator hoisting and fine-tuning operations required to find the alignment point, significantly reducing the time spent on large overhead cranes and other critical hoisting equipment, and simplifying the complexity of high-altitude and ground-based operations.

[0020] 4. In this invention, before installing the upper half of the generator set, at least two sets of symmetrically arranged guide positioning pins are installed at the split surface of the lower half of the generator set. The lower ends of these pins engage with pin holes on the supporting box, and the upper ends have guide sections with a length of not less than 100mm, providing a stable and precise guiding path for the closure of the upper half of the generator set. The upper half of the generator set is lifted horizontally at four points, and the horizontal deviation of the split surface is monitored in real time and maintained to be less than 0.03mm / m. During the closure process, a feeler gauge is used to check the contact gap of the split surface throughout the process, ensuring that the overall contact gap of the split surface after the upper and lower half of the generator set is no greater than 0.05mm. This ensures the overall rigidity and sealing performance of the generator set, and is especially suitable for large-capacity generators with extremely high requirements for installation accuracy and sealing.

[0021] 5. In this invention, the four fixed brackets are located at the same height as the inner stator, forming a symmetrical constraint. This effectively avoids torsional torque caused by uneven force, ensuring that the inner stator reference remains absolutely stable during long-term installation. This provides a reliable reference guarantee for the subsequent precise alignment and adjustment of the lower half of the frame.

[0022] 6. This invention optimizes the process specifically for the structural characteristics of the split-type machine base. First, the precise alignment of the lower half of the machine base with the inner stator and the connection of the spring plate are completed independently. Then, the upper half of the machine base is assembled. This allows the most complex and precision-requiring alignment operation to be completed within the open and visible space of the lower half of the machine base. In particular, the spring plate is installed from the split surface of the lower half of the machine base, providing ample operating space and facilitating critical operations such as gap checks and bolt tightening. This greatly simplifies construction and ensures connection quality. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the split frame after the inner and outer stators are installed. Figure 2 This is an axial schematic diagram of the split frame after the inner and outer stators have been installed. Figure 3 This is a schematic diagram of the inner stator hoisting process. Figure 4This is a schematic diagram showing the installation of the inner stator and the lower half of the frame; Figure 5 A schematic diagram showing the axial installation of the inner stator and the lower half of the frame; Marked in the image: 1. Lower half of the machine base; 2. Inner stator; 3. Upper half of the machine base; 4. Spring plate; 5. Support box; 6. Fixed bracket; 7. Adjustable base; 8. Jack; 9. Protective pad; 10. Installation platform; 11. Soft sling. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1 As the most basic embodiment of the present invention, refer to Figures 1-5 This embodiment discloses a method for installing the inner and outer stators of a split-frame, including the following steps: S1. The lower half of the machine base 1 is initially fixed on the installation platform 10 by the support box 5, and the height of the lower half of the machine base 1 is adjusted and adjusted to a horizontal state. S2. Multiple independent adjustable bases 7 are set below the lower half of the base 1. The bottom of the lower half of the base 1 has an operation hole at the position corresponding to the adjustable base 7. The multiple adjustable bases 7 are placed on the mounting platform 10 and adjusted to be horizontal. The inner stator 2 is hoisted into the lower half of the base 1 and placed on the adjustable base 7. The inner stator 2 is found to the horizontal center through the adjustable base 7. This horizontal center is at the same height as the horizontal center of the lower half of the base 1. S3. Four fixed brackets 6 are symmetrically arranged on both sides of the lower half of the base 1. One end of the fixed bracket 6 is fixed on the mounting platform 10, and the other end is symmetrically fixed to the inner stator 2 by bolts, so as to ensure that the inner stator 2 is reliably fixed and will not flip. S4. Multiple jacks 8 are symmetrically arranged on both ends and both sides of the lower half-base 1. The horizontal axial position of the lower half-base 1 is adjusted by the jacks 8 on the end faces, and the horizontal lateral position of the lower half-base 1 is adjusted by the jacks 8 on the sides. While keeping the position of the inner stator 2 unchanged, the relative dimensions between the axial center of the inner stator 2 core and the inner circle reference surface of the lower half-base 1 are found by using a collimator. The axial center line of the lower half-base 1 is finely adjusted until it coincides with the axial center line of the inner stator 2. The dimensions of the end face of the inner stator 2 core and the reference end face of the lower half-base 1 are measured, and the central vertical plane of the lower half-base 1 is made coplanar with the central vertical plane of the inner stator 2. S5. After the inner stator 2 and the lower half of the base 1 are aligned, the lower half of the base 1 is fixedly supported, and a spring plate 4 is installed from the split surface of the lower half of the base 1. The inner stator 2 and the lower half of the base 1 are connected by double-sided welding of the spring plate 4. S6. Install the upper half of the machine base 3. After completing the assembly of the upper and lower half of the machine base 1, lift the machine base vertically, remove the support base, and seal the operating hole of the lower half of the machine base 1 with a manhole cover.

[0026] This embodiment effectively protects key components such as the inner stator 2 core and windings from damage during installation and improves assembly accuracy.

[0027] Example 2 As a preferred embodiment of the present invention, refer to Figures 1-5 This embodiment discloses a method for installing the inner and outer stators of a split-frame, including the following steps: S1. By symmetrically arranging multiple sets of support boxes 5 on the installation platform 10, the middle split side support edge of the lower half base 1 is placed and supported on the top surface of the support box 5, thus achieving the initial fixation of the lower half base 1 on the installation platform 10. By adjusting the height of the support box 5 and using a level as an aid, the upper plane of the lower half base 1 is adjusted to a precise level. The support box is fixed to the installation platform with bolts. The upper surface of the support box and the bottom plate of the lower half base are both precision machined to reduce the friction between them. S2. Two independent adjustable bases 7 are set below the lower half of the base 1. The bottom of the lower half of the base 1 has an operating hole at the position corresponding to the adjustable base 7. The adjustable base 7 is placed on the mounting platform 10 along the axial projection of the lower half of the base 1. It is adjusted to be horizontal and the height of the adjustable base 7 is adjusted in advance according to the size of the lower half of the base 1 and the inner stator 2. The inner stator 2 is lifted with a soft sling 11, centered in the lower half of the base 1 and placed on the adjustable base 7. A protective pad 9 is placed between the top surface of the adjustable base 7 and the outer shell of the inner stator 2 to protect the inner stator 2 and prevent damage to the insulation of the inner stator 2. Then, the operator finely adjusts the lifting height of the adjustable base 7 to make the horizontal center of the inner stator 2 equal to the horizontal center of the lower half of the base 1. S3. Four fixed brackets 6 are symmetrically arranged on both sides of the lower half of the base 1. One end of the fixed bracket 6 is fixed to the mounting platform 10 by bolts, and the other end is connected to the side of the inner stator 2 by bolts. The connection points of the four fixed brackets 6 and the inner stator 2 are at the same height, forming a symmetrical fixation, which effectively prevents the inner stator 2 from twisting in any subsequent operation and becomes a fixed spatial reference. S4. Multiple jacks 8 are symmetrically arranged on both ends and both sides of the lower half-base 1. The horizontal axial position of the lower half-base 1 is adjusted by the jacks 8 on the end faces, and the horizontal lateral position of the lower half-base 1 is adjusted by the jacks 8 on the sides. While keeping the position of the inner stator 2 unchanged, the relative dimensions between the axial center of the inner stator 2 core and the inner circle reference surface of the lower half-base 1 are found by using a collimator. The axial center line of the lower half-base 1 is finely adjusted until it coincides with the axial center line of the inner stator 2. The dimensions of the end face of the inner stator 2 core and the reference end face of the lower half-base 1 are measured, and the central vertical plane of the lower half-base 1 is made coplanar with the central vertical plane of the inner stator 2. S5. After the inner stator 2 and the lower half of the base 1 are aligned, the lower half of the base 1 is fixedly supported, and a spring plate 4 is installed from the split surface of the lower half of the base 1. The inner stator 2 and the lower half of the base 1 are connected by double-sided welding of the spring plate 4. S6. Install the upper half of the machine base 3. After completing the assembly of the upper and lower half of the machine base 1, lift the machine base vertically, remove the support base, and seal the operating hole of the lower half of the machine base 1 with a manhole cover.

[0028] In this embodiment, a protective pad 9 is added between the adjustable base 7 and the inner stator 2, which effectively isolates the tooling from direct contact with the stator body, avoiding stress concentration and insulation damage. The connection points of the four fixed brackets 6 and the inner stator 2 are set at the same height, forming a symmetrical and balanced constraint force system, which can effectively resist the torsional torque that may be generated by the inner stator 2 during the adjustment process, ensuring its absolute stability as a fixed reference. This embodiment is highly adapted to the structural characteristics of the split frame, providing a standardized, replicable, safe and efficient installation solution for large split frame generators.

[0029] Example 3 As a preferred embodiment of the present invention, refer to Figures 1-5 This embodiment discloses a method for installing the inner and outer stators of a split-frame, including the following steps: S1. By symmetrically arranging multiple sets of support boxes 5 on the installation platform 10, the middle split side support edge of the lower half base 1 is placed and supported on the top surface of the support box 5, so as to achieve the initial fixation of the lower half base 1 on the installation platform 10. By adjusting the height of the support box 5 and using a level to assist, the upper plane of the lower half base 1 is adjusted to a precise level. S2. Two independent adjustable bases 7 are set below the lower half of the base 1. The bottom of the lower half of the base 1 has an operating hole at the position corresponding to the adjustable base 7. The adjustable base 7 is placed on the mounting platform 10 along the axial projection of the lower half of the base 1. It is adjusted to be horizontal and the height of the adjustable base 7 is adjusted in advance according to the size of the lower half of the base 1 and the inner stator 2. The inner stator 2 is lifted with a soft sling 11, centered in the lower half of the base 1 and placed on the adjustable base 7. A protective pad 9 is placed between the top surface of the adjustable base 7 and the outer shell of the inner stator 2 to protect the inner stator 2 and prevent damage to the insulation of the inner stator 2. Then, the operator finely adjusts the lifting height of the adjustable base 7 to make the horizontal center of the inner stator 2 equal to the horizontal center of the lower half of the base 1. S3. Four fixed brackets 6 are symmetrically arranged on both sides of the lower half of the base 1. One end of the fixed bracket 6 is fixed to the mounting platform 10 by bolts, and the other end is connected to the side of the inner stator 2 by bolts. The connection points of the four fixed brackets 6 and the inner stator 2 are at the same height, forming a symmetrical fixation, which effectively prevents the inner stator 2 from twisting in any subsequent operation and becomes a fixed spatial reference. S4. Multiple jacks 8 are symmetrically arranged on both ends and both sides of the lower half-base 1. The horizontal axial position of the lower half-base 1 is adjusted by the jacks 8 on the end faces, and the horizontal lateral position of the lower half-base 1 is adjusted by the jacks 8 on the sides. While keeping the position of the inner stator 2 unchanged, the relative dimensions between the axial center of the inner stator 2 core and the inner circle reference surface of the lower half-base 1 are found by using a collimator. The axial center line of the lower half-base 1 is finely adjusted until it coincides with the axial center line of the inner stator 2. The dimensions of the end face of the inner stator 2 core and the reference end face of the lower half-base 1 are measured, and the central vertical plane of the lower half-base 1 is made coplanar with the central vertical plane of the inner stator 2. S5. After the inner stator 2 and the lower half of the base 1 are aligned, the lower half of the base 1 is fixedly supported, and a spring plate 4 is installed from the split surface of the lower half of the base 1. The inner stator 2 and the lower half of the base 1 are connected by double-sided welding of the spring plate 4. S6. Install at least two sets of symmetrical guide positioning pins along the axis at the split surface of the lower half of the base 1. The lower end of the guide positioning pin is positioned and engaged with the pin hole on the support box 5. The upper end is provided with a guide section with a length of not less than 100mm. The upper half of the base 3 is lifted horizontally at four points. The horizontal deviation of the split surface is monitored in real time and kept less than 0.03mm / m. The upper and lower half of the base 1 are slowly lowered along the guide positioning pin to complete the assembly. During the assembly process, the feeler gauge is used to check the fit gap of the split surface throughout the process to ensure that the overall fit gap of the split surface after the upper and lower half of the base 1 is assembled is not greater than 0.05mm. Install the upper half of the base 3. After the upper and lower half of the base 1 are assembled, lift the base vertically and remove the support box 5. The operating hole of the lower half of the base 1 is sealed with a manhole cover.

[0030] In this embodiment, at least two sets of guide positioning pins are installed at the split surface of the lower half of the base 1. Their lower ends are positioned and fitted with the supporting box 5, and their upper ends are equipped with guide sections. Combined with real-time monitoring of the horizontal deviation of the split surface during the four-point horizontal lifting process, a stable and precise guiding path is provided for the closure of the upper half of the base 3. This effectively avoids bolt hole misalignment or damage to the sealing surface caused by skewness. During installation, a feeler gauge is used to check the fitting gap throughout the process, ensuring that the final overall fitting gap of the split surface is no greater than 0.05mm. This precision requirement directly guarantees the overall rigidity and sealing performance of the base. This embodiment is particularly suitable for high-end equipment such as large-capacity hydrogen-cooled generators that have extremely high requirements for installation accuracy and sealing performance, and has outstanding engineering application value.

Claims

1. A method for installing the inner and outer stators of a split-frame, characterized in that, Includes the following steps: S1. The lower half of the machine base (1) is initially fixed on the installation platform (10) by the support box (5), and the height of the lower half of the machine base (1) is adjusted and adjusted to a horizontal state. S2. Multiple independent adjustable bases (7) are set below the lower half of the base (1). The bottom of the lower half of the base (1) has an operation hole at the position corresponding to the adjustable base (7). The multiple adjustable bases (7) are placed on the mounting platform (10) and adjusted to be horizontal. The inner stator (2) is hoisted into the lower half of the base (1) and placed on the adjustable base (7). The inner stator (2) is found to be horizontally centered through the adjustable base (7). This horizontal center is at the same height as the horizontal center of the lower half of the base (1). S3. Four fixed brackets (6) are symmetrically arranged on both sides of the lower half of the base (1). One end of the fixed bracket (6) is fixed on the mounting platform (10), and the other end is symmetrically fixed to the inner stator (2) by bolts, so as to ensure that the inner stator (2) is reliably fixed and will not flip. S4. Multiple jacks (8) are symmetrically arranged on both ends and sides of the lower half of the machine base (1). The horizontal axial position of the lower half of the machine base (1) is adjusted by the jacks (8) at the end faces, and the horizontal lateral position of the lower half of the machine base (1) is adjusted by the jacks (8) at the sides. While keeping the position of the inner stator (2) unchanged, the relative dimensions of the axial center of the inner stator (2) core and the inner circle reference surface of the lower half of the machine base (1) are found by using a collimator. The axial center line of the lower half of the machine base (1) is finely adjusted to coincide with the axial center line of the inner stator (2). The dimensions of the end face of the inner stator (2) core and the reference end face of the lower half of the machine base (1) are measured, and the central vertical surface of the lower half of the machine base (1) is made coplanar with the central vertical surface of the inner stator (2). S5. After the inner stator (2) and the lower half of the frame (1) are aligned, the lower half of the frame (1) is fixedly supported, and a spring plate (4) is installed from the split surface of the lower half of the frame (1). The inner stator (2) and the lower half of the frame (1) are connected by double-sided welding of the spring plate (4). S6. Install the upper half of the machine base (3). After completing the assembly of the upper and lower half of the machine base (1), lift the machine base vertically, remove the support base, and seal the operating hole of the lower half of the machine base (1) with a manhole cover.

2. The method for installing the inner and outer stators of a split-frame according to claim 1, characterized in that: In S6, before installing the upper half of the base (3), at least two sets of symmetrical guide positioning pins along the axis are installed at the split surface of the lower half of the base (1). The lower end of the guide positioning pin is positioned and engaged with the pin hole on the support box (5), and the upper end is provided with a guide section with a length of not less than 100mm.

3. The method for installing the inner and outer stators of a split-frame according to claim 2, characterized in that: In the S6, the upper half of the base (3) is installed by four-point horizontal lifting, and the horizontal deviation of the split surface is monitored in real time and kept less than 0.03mm / m. The upper and lower half of the base (1) are slowly lowered along the guide positioning pin to complete the assembly. During the box assembly process, the feeler gauge is used to check the joint gap of the split surface throughout the process to ensure that the overall joint gap of the split surface after the upper and lower half of the base (1) is assembled is not greater than 0.05mm.

4. The method for installing the inner and outer stators of a split-frame according to claim 1, characterized in that: The engagement points of the four fixed supports (6) and the inner stator (2) are at the same height in space.

5. The method for installing the inner and outer stators of a split-frame according to claim 1, characterized in that: A protective pad (9) for protecting the inner stator (2) is placed between the top surface of the adjustable base (7) and the outer shell of the inner stator (2).

6. The method for installing the inner and outer stators of a split-frame according to claim 1, characterized in that: In S1, the lower half of the machine base (1) is adjusted to a horizontal state with the help of a level.

7. The method for installing the inner and outer stators of a split-frame according to claim 1, characterized in that: In S1, multiple sets of support boxes (5) symmetrically arranged on the installation platform (10) are used to place the middle support edge of the lower half base (1) on the top surface of the support box (5), thereby achieving the initial fixation of the lower half base (1) on the installation platform (10).

8. The method for installing the inner and outer stators of a split-frame according to claim 7, characterized in that: The support box and the installation platform are fixed with bolts. The upper surface of the support box and the lower half of the base plate are both precision machined to reduce the friction between them.

9. The method for installing the inner and outer stators of a split-frame according to claim 1, characterized in that: The adjustable base (7) is pre-arranged on the axis projection of the lower half base (1).

10. A method for installing inner and outer stators of a split-frame according to claim 9, characterized in that: At least two adjustable bases (7) are provided along the axis of the lower half of the base (1).

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