A method for assembling a rear bearing inner ring of a main shaft system of a wind turbine generator

Abstract

The application discloses a kind of wind turbine main shaft system rear bearing inner ring assembly method, hoist bearing seat assembly to the main shaft in place, and adjust the alignment degree of bearing seat and main shaft until meet the requirement;Again measure the height difference of main shaft end face and rear bearing outer circle small end face, using the value is substituted into formula calculation to obtain the height of product pressing plate. And heat rear bearing inner ring, and pressing plate tool and rear bearing inner ring are assembled into an organic whole;Again on the main shaft end face uniform distribution installs multiple sets of shim tool, hoists rear bearing inner ring assembly to the main shaft in place, connects main shaft end face, shim tool, pressing plate tool and hollow jack, so that jack output pressure, until room temperature is restored;Then dismount pressing plate tool, shim tool;Install the product pressing plate after matching and grinding, connect product pressing plate and main shaft end face, install rear bearing inner ring in place. Realize the accurate measurement of data, and can control rear bearing inner ring to prevent overpressure.

Description

Technical Field

[0001] This invention relates to the field of wind turbine assembly technology, and in particular to a method for assembling the inner ring of the rear bearing of a wind turbine main shaft system. Background Technology

[0002] Currently, the main shaft system of a semi-direct drive wind turbine consists of two single-row tapered roller bearings, and the common assembly process is as follows:

[0003] (1) Install the inner ring of the front bearing onto the spindle.

[0004] (2) Install the outer rings of the front and rear bearings into place on the bearing housing.

[0005] (3) Hoist the bearing housing assembly (including the bearing housing and two outer rings) onto the main shaft.

[0006] (4) After heating and hoisting, the inner ring of the bearing is placed on the main shaft.

[0007] (5) Place multiple sets of pad fixtures evenly on the end face of the spindle, and hoist the product pressure plate onto the pad fixtures. Install multiple sets of threaded fasteners evenly to connect the product pressure plate, pad fixtures and spindle end face. Install hollow hydraulic jacks on the threaded fasteners and press the product pressure plate down simultaneously, and then press the inner ring of the rear bearing down until it returns to room temperature.

[0008] (6) Remove the product pressure plate and pad tooling, measure the height difference between the spindle end face and the small end face of the rear bearing outer ring, substitute this value into the formula to calculate the stop height of the product pressure plate, which is the height difference between the spindle end face and the large end face of the rear bearing inner ring when the rear bearing inner ring is assembled in place.

[0009] (7) Adjust the stop height of the grinding product pressure plate according to the calculation results.

[0010] (8) Install the product pressure plate after grinding, connect the product pressure plate with the threaded fasteners on the end face of the spindle, and install the inner ring of the rear bearing in place.

[0011] The above assembly process has the following problems or risks:

[0012] (1) The inner ring of the rear bearing is an interference fit with the spindle. The radial pressure generated by the interference causes deformation of the spindle end face. This deformation affects the accuracy of the measurement of the height difference between the spindle end face and the small end face of the outer ring of the rear bearing.

[0013] (2) The above operation uses the product pressure plate to press down the inner ring of the bearing for alignment, that is, to align the outer ring of the bearing with the inner ring of the bearing. However, this cannot guarantee a good alignment between the inner ring of the bearing and the spindle. The degree of alignment can be measured by the deviation of the eight-point height difference between the end face of the spindle and the large end face of the inner ring of the bearing. If the deviation is too large, it will cause the local clearance between the inner ring rollers and the outer ring raceway of the bearing to be negative. That is, the inner ring has already applied additional axial pressure to the outer ring before measurement, which does not meet the measurement requirements and affects the final bearing clearance. In addition, if the inner ring is misaligned on the spindle, it will also lead to the risk of excessive local stress and damage to the inner ring rollers and outer ring raceway when the product pressure plate is installed after grinding.

[0014] (3) If the thickness of the pad tooling is not selected properly, there is a risk of excessive pressure on the inner ring before the measurement data, that is, the clearance between the inner ring roller and the outer ring raceway of the rear bearing is negative. Summary of the Invention

[0015] The purpose of this invention is to address the aforementioned problems by providing an assembly method for the inner ring of the rear bearing in a wind turbine main shaft system. This method allows for adjusting the alignment between the bearing housing and the main shaft until the requirements are met before measuring the height difference between the end face of the main shaft and the small end face of the outer ring of the rear bearing. This enables accurate data measurement and also helps control the inner ring of the rear bearing to prevent excessive pressure.

[0016] The technical solution adopted in this invention is as follows:

[0017] A method for assembling the inner ring of the rear bearing of a wind turbine main shaft system includes the following steps:

[0018] Step 1: Install the inner ring of the front bearing onto the spindle.

[0019] Step 2: Install the front bearing outer ring and the rear bearing outer ring into place on the bearing housing;

[0020] Step 3: Hoist the bearing housing assembly onto the spindle and adjust the alignment between the bearing housing and the spindle until the requirements are met;

[0021] Step 4: Measure the height difference between the end face of the spindle and the small end face of the outer ring of the rear bearing, and use this value to calculate the stop height of the product pressure plate.

[0022] Step 5: Adjust the stop height of the product pressure plate according to the calculation results;

[0023] Step 6: Heat the inner ring of the rear bearing, and assemble the pressure plate fixture and the inner ring of the rear bearing into one piece;

[0024] Step 7: Install multiple sets of pads evenly on the upper end face of the spindle. After hoisting, position the bearing inner ring assembly on the spindle. Connect the spindle end face, pads, pressure plate, and hollow jack to make the jack output pressure until the room temperature is restored.

[0025] Step 8: Disassemble the pressure plate fixture and the pad fixture;

[0026] Step 9: Install the product pressure plate after grinding, connect the product pressure plate to the end face of the spindle, and install the inner ring of the rear bearing into place.

[0027] Alternatively, in step 3, the degree of alignment is measured by the deviation of the eight-point height difference between the spindle end face and the large end face of the rear bearing inner ring.

[0028] Alternatively, in step 3, the alignment between the bearing housing and the spindle is adjusted by a guide fixture; the guide fixture includes a first mounting assembly mounted on the bearing housing and a second mounting assembly mounted on the spindle, the first mounting assembly being connected to a plurality of radial telescopic components, the radial telescopic components contacting the second mounting assembly to adjust the radial offset of the spindle.

[0029] Alternatively, step 3 may include the following steps:

[0030] Step 3.1: Install the first mounting component of the guide fixture onto the bearing housing, and install the second mounting component of the guide fixture onto the spindle;

[0031] Step 3.2: Hoist the bearing housing assembly onto the spindle and position it.

[0032] Step 3.3: Adjust the radial telescopic component of the guide fixture so that its support surface contacts the positioning cylindrical surface of the spindle. Rotate the bearing seat and continuously adjust the radial telescopic component until the alignment between the bearing seat and the spindle meets the requirements.

[0033] Alternatively, the first mounting assembly includes a support plate mounted on the upper part of the bearing housing, the support plate being connected to the bearing housing via a first connector; a connecting plate is provided below the support plate, the connecting plate being connected to the radial telescopic assembly; and a stiffening rib is provided between the connecting plate and the support plate.

[0034] Alternatively, the second mounting assembly includes a positioning ring mounted on the upper part of the spindle, the outer periphery of the positioning ring being connected to the spindle via a second connector; the interior of the positioning ring is provided with a positioning annular surface, the positioning annular surface contacting the radial telescopic assembly.

[0035] Alternatively, the radial telescopic assembly includes a movable block with a screw screwed into its radially inner side, the screw being rotatably fixed to a first mounting assembly; the first mounting assembly has a radially extending strip groove, the upper part of the movable block being connected to the strip groove via a third connector, the third connector being movable along the strip groove.

[0036] Alternatively, the radially outer side of the movable block has an arc-shaped support surface.

[0037] Alternatively, the radially outer side of the movable block is provided with a bearing via a connecting shaft, the bearing being in contact with the second mounting assembly.

[0038] Alternatively, the second mounting assembly may include an oil receiving groove.

[0039] Optionally, the pressure plate fixture includes a first pressing surface corresponding to the upper end face of the pad fixture and a second pressing surface corresponding to the upper end face of the inner ring of the rear bearing; the first pressing surface is provided with a first through hole corresponding to the threaded hole of the spindle, and a first tensioning bolt is provided in the first through hole; the second pressing surface is provided with a second through hole corresponding to the upper threaded hole of the inner ring of the rear bearing, and a second tensioning bolt is provided in the second through hole.

[0040] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0041] 1. The assembly method for the inner ring of the rear bearing of a wind turbine main shaft system provided by this invention can adjust the alignment of the bearing housing and the main shaft, ensuring accurate alignment between the bearing housing and the main shaft. This avoids measurement errors caused by poor alignment. Furthermore, it allows for the pre-measurement of the height difference between the end face of the main shaft and the small end face of the outer ring of the rear bearing, before the inner ring is installed, thus avoiding measurement errors caused by interference fit of the inner ring.

[0042] 2. The assembly method for the inner ring of the rear bearing of a wind turbine main shaft system provided by this invention, by assembling the pressure plate fixture and the inner ring of the rear bearing into one unit, can effectively control the amount of downward pressure on the inner ring and prevent excessive pressure from causing excessive local stress damage to the inner ring of the bearing. Precise control of the installation pressure of the inner ring avoids deformation of the main shaft end face caused by radial pressure from interference fit. Attached Figure Description

[0043] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0044] Figure 1 This is a schematic diagram of the bearing housing and spindle assembly.

[0045] Figure 2 This is a schematic diagram of the guide tooling assembly.

[0046] Figure 3 This is a schematic diagram of the internal structure of the guide tooling.

[0047] Figure 4 This is a schematic diagram of the pressure plate tooling assembly.

[0048] In the diagram, the markings are: 1-bearing housing, 2-spindle, 3-front bearing inner ring, 4-front bearing outer ring, 5-rear bearing outer ring, 6-rear bearing inner ring, 7-guide fixture, 71-first mounting assembly, 711-support plate, 7111-first bottom surface, 7112-first side surface, 712-first connecting piece, 713-radial positioning part, 714-rib plate, 715-axial positioning part, 72-second mounting assembly, 721-locating ring. 7211-Positioning annular surface, 7212-Second bottom surface, 7213-Second side surface, 722-Second connecting piece, 723-Oil receiving groove, 73-Radial telescopic assembly, 731-Moving block, 732-Screw, 733-Third connecting piece, 734-Arc support surface, 735-Connecting shaft, 736-Bearing, 8-Product pressure plate, 9-Pressure plate fixture, 91-First pressing surface, 92-Second pressing surface, 10-Pad fixture. Detailed Implementation

[0049] The present invention will now be described in detail with reference to the accompanying drawings.

[0050] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0051] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is merely one example of a series of equivalent or similar features.

[0052] A method for assembling the inner ring of the rear bearing in a wind turbine main shaft system, such as... Figure 1-4 As shown, it includes the following steps:

[0053] Step 1: Install the inner ring 3 of the front bearing onto the spindle 2.

[0054] Step 2: Install the front bearing outer ring 4 and the rear bearing outer ring 5 into place on the bearing housing 1;

[0055] Step 3: Hoist the bearing housing 1 assembly onto the spindle 2 and adjust the alignment between the bearing housing 1 and the spindle 2 until the requirements are met;

[0056] Step 4: Measure the height difference between the end face of spindle 2 and the small end face of the outer ring 5 of the rear bearing, and use this value to calculate the stop height of the product pressure plate 8.

[0057] Step 5: Adjust the stop height of the product pressure plate 8 according to the calculation results;

[0058] Step 6: Heat the inner ring 6 of the rear bearing, and assemble the pressure plate fixture 9 and the inner ring 6 of the rear bearing into one piece;

[0059] Step 7: Install multiple sets of pad fixtures 10 evenly on the upper end face of the main shaft 2. After hoisting, the bearing inner ring 6 assembly is placed on the main shaft 2. Connect the end face of the main shaft 2, the pad fixtures 10, the pressure plate fixtures 9 and the hollow jack, so that the jack outputs pressure until the room temperature is restored.

[0060] Step 8, disassemble pressure plate fixture 9, and pad fixture 10;

[0061] Step 9: Install the product pressure plate 8 after grinding, connect the product pressure plate 8 to the end face of the main shaft 2, and install the inner ring 6 of the rear bearing into place.

[0062] In step 3, after hoisting the bearing housing 1 assembly onto the spindle 2, immediately adjust the alignment of the bearing housing 1 and the spindle 2. This ensures that the bearing housing 1 and the spindle 2 are in the correct relative position before measuring the height difference, avoiding measurement errors caused by poor alignment in subsequent steps. In step 4, measure the height difference between the end face of the spindle 2 and the small end face of the outer ring 5 of the rear bearing. Since the alignment has been adjusted, the measurement result is more accurate. In step 6, assemble the pressure plate fixture 9 and the inner ring 6 of the rear bearing into one piece. This allows the pressure plate fixture 9 to both press and pull on the inner ring 6 of the rear bearing during subsequent operations, ensuring that the inner ring 6 of the rear bearing does not shift axially relative to the spindle 2 during heating and installation. In step 7, use a hollow jack to output pressure, which can precisely control the installation pressure of the inner ring 6 of the rear bearing, avoiding deformation of the end face of the spindle 2 caused by radial pressure from the interference fit.

[0063] In another specific implementation, step 3 measures the alignment by the deviation of eight height differences between the end face of the spindle 2 and the large end face of the inner ring 6 of the rear bearing. These eight points are typically evenly distributed on the circumference of the bearing inner ring, with each point representing the alignment in one direction. By comparing the height differences of these eight points, the alignment deviation between the end face of the spindle 2 and the large end face of the bearing inner ring can be analyzed. After measuring the eight height differences, if the deviation exceeds the allowable range, the bearing housing 1 needs to be fine-tuned until the height differences of all eight points are within acceptable limits. This ensures precise alignment between the bearing inner ring and the spindle 2. Specifically, the deviation should generally be less than 0.05 mm.

[0064] In another specific implementation, in step 3, the alignment of the bearing housing 1 and the spindle 2 is adjusted using the guide fixture 7. The guide fixture 7 includes a first mounting assembly 71 mounted on the bearing housing 1 and a second mounting assembly 72 mounted on the spindle 2. The first mounting assembly 71 is connected to multiple radial telescopic components 73, which contact the second mounting assembly 72 to adjust the radial offset of the bearing housing 1. The first mounting assembly 71 is mounted on the bearing housing 1 to fix and support the radial telescopic components 73. The radial telescopic components 73, connected to the first mounting assembly 71, can contact the second mounting assembly 72 and generate radial force to adjust the radial position of the bearing housing 1. The second mounting assembly 72 is mounted on the spindle 2 and interacts with the radial telescopic components 73 of the first mounting assembly 71, thereby moving the bearing housing 1 and adjusting its position. By adjusting the radial telescopic components 73, the radial position of the bearing housing 1 can be fine-tuned, i.e., the offset of the bearing housing 1 relative to the spindle 2 can be adjusted. These telescopic components can be screw jacks, hydraulic cylinders, or other devices capable of providing precise radial force. During the adjustment process, the operator measures the relative position of the spindle 2 and the bearing housing 1 to ensure that they achieve the alignment accuracy required by the design.

[0065] As another specific implementation, step 3 includes the following steps:

[0066] Step 3.1: Install the first mounting component 71 of the guide fixture 7 onto the bearing housing 1, and install the second mounting component 72 of the guide fixture 7 onto the spindle 2;

[0067] Step 3.2: Hoist the bearing housing 1 assembly onto the main shaft 2 and place it in place;

[0068] Step 3.3: Adjust the radial telescopic component 73 of the guide fixture 7 so that its support surface contacts the positioning cylindrical surface of the main shaft 2. Rotate the bearing seat 1 and continuously adjust the radial telescopic component 73 until the alignment between the bearing seat 1 and the main shaft 2 meets the requirements.

[0069] By fine-tuning the radial telescopic component 73, precise alignment of the bearing housing 1 with the spindle 2 can be achieved. Furthermore, by pre-measuring the height difference, the interference fit between the rear bearing inner ring 6 and the spindle 2 is avoided, which could lead to deformation of the spindle 2 end face and affect measurement accuracy, thus improving the accuracy of the measurement data. Moreover, because this solution ensures proper alignment between the rear bearing inner ring 6 and the spindle 2, it reduces the risk of damage caused by excessive localized stress on the inner ring rollers and outer ring raceways.

[0070] In another specific embodiment, the first mounting assembly 71 includes a support plate 711 mounted on the upper part of the bearing housing 1, the support plate 711 being connected to the bearing housing 1 via a first connector 712; a connecting plate is provided below the support plate 711, the connecting plate being connected to the radial telescopic assembly 73; a rib 714 is provided between the connecting plate and the support plate 711. Specifically, the support plate 711 is cross-shaped; the first bottom surface 7111 of the support plate 711 engages with the upper end surface of the bearing housing 1, and the first side surface 7112 of the support plate 711 mates with the inner ring surface of the bearing housing 1; the connecting plate has an axial positioning portion 715 and a radial positioning portion 713 for axial and radial positioning of the radial telescopic assembly 73, respectively. The support plate 711, located on the upper part of the bearing housing 1, provides support for the entire first mounting assembly 71. The first connector 712, which can be a bolt, is used to fix the support plate 711 to the bearing housing 1. The support plate 711 can be easily mounted on the bearing housing 1 via the first connector 712. A connecting plate, located below the support plate 711 and connected to the radial telescopic assembly 73, is used to transmit radial force. A stiffening rib 714 is positioned between the support plate 711 and the connecting plate to enhance the structural strength and stability of the entire first mounting assembly 71. The cross-shaped support plate 711 provides four independent adjustment points in the circumferential direction, evenly distributed around the bearing housing 1 at 90-degree intervals. This layout ensures that the spindle 2 can be evenly pushed and pulled from four different directions during adjustment, achieving precise alignment. The first bottom surface 7111 of the support plate 711 engages with the upper end surface of the bearing housing 1, providing a stable support base and ensuring that the support plate 711 does not move or tilt during the entire adjustment process. The first side surface 7112 of the support plate 711 mates with the inner circumferential surface of the bearing housing 1, helping to prevent radial displacement of the support plate 711. The axial positioning part 715 is a horizontal plate that contacts the top or bottom of the radial expansion assembly 73 and is connected to the assembly by fixing bolts or other fasteners to prevent axial displacement. The radial positioning part 713 is a vertical plate that is fixedly connected to the fixed end of the radial expansion assembly 73 to ensure the correct radial position of the assembly. The design of the axial positioning part 715 and the radial positioning part 713 increases the overall rigidity of the connecting plate and enhances the connection stability between the radial expansion assembly 73 and the connecting plate.

[0071] In another specific embodiment, the second mounting assembly 72 includes a positioning ring 721 mounted on the upper part of the spindle 2. The outer periphery of the positioning ring 721 is connected to the spindle 2 via a second connector 722. The interior of the positioning ring 721 has a positioning annular surface 7211, which contacts the radial telescopic assembly 73. The positioning ring 721 is connected to the spindle 2 via the second connector 722 (such as a bolt, clamping device, etc.) to ensure that the positioning ring 721 is firmly fixed to the spindle 2. Since the positioning ring 721 is fixed to the spindle 2, the radial telescopic assembly 73 can adjust the position of the bearing seat 1 by contacting the positioning annular surface 7211, providing precise radial positioning so that the bearing seat 1 can be accurately aligned within the spindle 2. The design of the positioning ring 721 prevents the radial telescopic assembly 73 from directly contacting the spindle 2, thereby avoiding damage to the surface of the spindle 2. Specifically, the second bottom surface 7212 of the positioning ring 721 engages with the upper end surface of the spindle 2, and the second side surface 7213 of the positioning ring 721 mates with the inner ring surface of the spindle 2. The engagement of the second bottom surface 7212 of the positioning ring 721 with the upper end surface of the spindle 2 ensures the axial positioning of the positioning ring 721 on the spindle 2, while the mating of the second side surface 7213 of the positioning ring 721 with the inner ring surface of the spindle 2 provides radial positioning, preventing relative movement of the positioning ring 721 during assembly and ensuring assembly accuracy.

[0072] In another specific embodiment, the radial telescopic assembly 73 includes a movable block 731, with a screw 732 screwed into its radially inner side. The screw 732 is rotatably fixed to a first mounting assembly 71. The first mounting assembly 71 has a radially extending slot. The upper part of the movable block 731 is connected to the slot via a third connector 733, which is movable along the slot. The movable block 731 is the core part of the radial telescopic assembly 73. It can move radially on the first mounting assembly 71 to adjust the position of the spindle 2. By rotating the screw 732, the movable block 731 can move radially within the slot, thereby adjusting the relative position between the spindle 2 and the bearing seat 1 to achieve precise alignment. The slot design allows the movable block 731 to move radially within the slot while restricting its movement in other directions. The third connector 733, which can be a bolt, connects the upper part of the movable block 731 to the slot, allowing the movable block 731 to move along the slot. Furthermore, the radially outer side of the movable block 731 has an arc-shaped support surface 734. Due to the shape of the arc surface, when the movable block 731 is subjected to radial force, the point of application of the torque will be located on the center line of the arc surface, which helps to maintain the balance of the movable block 731 and reduce tilting and offset.

[0073] In another specific embodiment, a bearing 736 is provided on the radially outer side of the movable block 731 via a connecting shaft 735, and the bearing 736 contacts the second mounting assembly 72. The inner ring of the bearing 736 is fixed to the connecting shaft 735, and the outer ring contacts the second mounting assembly 72. When the main shaft 2 moves, the movement of the movable block 731 can be converted into rotational motion through the bearing 736, reducing the sliding friction between the positioning annular surface 7211 of the positioning ring 721 and the movable block 731.

[0074] In another specific embodiment, the second mounting assembly 72 is provided with an oil receiving groove 723. Furthermore, the oil receiving groove 723 is located at the bottom of the inner ring of the positioning ring 721 and below the bearing 736. The oil receiving groove 723 can collect lubricating oil or grease overflowing from the bearing 736, preventing it from flowing around or accumulating in unwanted places.

[0075] In another specific embodiment, the pressure plate fixture 9 includes a first pressing surface 91 corresponding to the upper end face of the pad fixture 10 and a second pressing surface 92 corresponding to the upper end face of the rear bearing inner ring 6. The first pressing surface 91 has a first through hole corresponding to the threaded hole of the spindle 2, and a first tensioning bolt is disposed within the first through hole. The second pressing surface 92 has a second through hole corresponding to the upper threaded hole of the rear bearing inner ring 6, and a second tensioning bolt is disposed within the second through hole. When the first tensioning bolt is tightened through the first through hole, it presses the pressure plate fixture 9 onto the pad fixture 10, and simultaneously, the pad fixture 10 presses against the end face of the spindle 2, thus forming a pressure transmission path from the pressure plate fixture 9 to the end face of the spindle 2. Simultaneously, when the second tensioning bolt is tightened through the second through hole, it pulls the rear bearing inner ring 6 towards the pressure plate fixture 9, thus forming a tension transmission path from the pressure plate fixture 9 to the rear bearing inner ring 6. This design allows the pressure plate fixture 9 to simultaneously apply clamping and tensile forces to the rear bearing inner ring 6. The clamping force ensures a tight fit between the rear bearing inner ring 6 and the spindle 2, while the tensile force helps to correctly position the rear bearing inner ring 6 on the spindle 2, preventing misalignment of the installation axis caused by thermal expansion of the rear bearing inner ring 6.

[0076] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A method of assembling a rear bearing inner race of a wind turbine main shaft system, characterized in that: Includes the following steps: Step 1: Install the inner ring (3) of the front bearing onto the spindle (2); Step 2: Install the front bearing outer ring (4) and the rear bearing outer ring (5) into place on the bearing housing (1); Step 3: Hoist the bearing housing (1) assembly onto the spindle (2) and adjust the alignment of the bearing housing (1) and the spindle (2) using the guide fixture (7) until the requirements are met; the guide fixture (7) includes a first mounting assembly (71) mounted on the bearing housing (1) and a second mounting assembly (72) mounted on the spindle (2). The first mounting assembly (71) is connected to a plurality of radial telescopic assemblies (73), and the radial telescopic assemblies (73) contact the second mounting assembly (72) to adjust the radial offset of the bearing housing (1); Step 4: Measure the height difference between the end face of the spindle (2) and the small end face of the outer ring (5) of the rear bearing, and use this value to calculate the stop height of the product pressure plate (8) using the formula. Step 5: Adjust the stop height of the grinding product pressure plate (8) according to the calculation results; Step 6: Heat the inner ring (6) of the rear bearing and assemble the pressure plate fixture (9) and the inner ring (6) of the rear bearing into one piece; Step 7: Install multiple sets of pad fixtures (10) evenly on the upper end face of the main shaft (2), and hoist the bearing inner ring (6) assembly onto the main shaft (2). Connect the end face of the main shaft (2), pad fixtures (10), pressure plate fixtures (9) and hollow jacks to make the jacks output pressure until the room temperature is restored. Step 8: Disassemble the pressure plate fixture (9) and the pad fixture (10); Step 9: Install the product pressure plate (8) after grinding, connect the product pressure plate (8) to the end face of the main shaft (2), and install the inner ring (6) of the rear bearing in place.

2. The method of assembling the inner race of the main shaft system rear bearing of a wind turbine generator set as claimed in claim 1, wherein: In step 3, the degree of alignment is measured by the deviation of the eight-point height difference between the end face of the spindle (2) and the large end face of the inner ring (6) of the rear bearing.

3. The assembly method of the inner ring of the rear bearing of the wind turbine main shaft system as described in claim 1, characterized in that: Step 3 includes the following steps: Step 3.1: Install the first mounting component (71) of the guide fixture (7) on the bearing seat (1), and install the second mounting component (72) of the guide fixture (7) on the spindle (2); Step 3.2: Hoist the bearing housing (1) assembly onto the main shaft (2) and position it in place; Step 3.3: Adjust the radial telescopic component (73) of the guide fixture (7) so that its support surface contacts the positioning cylindrical surface of the main shaft (2). Rotate the bearing seat (1) and continuously adjust the radial telescopic component (73) until the alignment between the bearing seat (1) and the main shaft (2) meets the requirements.

4. The method of assembling the inner race of the main shaft system rear bearing of a wind turbine generator as set forth in claim 1, wherein: The first mounting assembly (71) includes a support plate (711) mounted on the upper part of the bearing housing (1), the support plate (711) being connected to the bearing housing (1) via a first connector (712); a connecting plate is provided below the support plate (711), the connecting plate being connected to the radial telescopic assembly (73); and a stiffening rib (714) is provided between the connecting plate and the support plate (711).

5. The method of assembling the inner race of the main shaft system rear bearing of a wind turbine generator as set forth in claim 1, wherein: The second mounting assembly (72) includes a positioning ring (721) mounted on the upper part of the spindle (2), the outer periphery of the positioning ring (721) being connected to the spindle (2) via a second connector (722); the positioning ring (721) has a positioning annular surface (7211) inside, and the positioning annular surface (7211) is in contact with the radial telescopic assembly (73).

6. The assembly method of the rear bearing inner ring of the wind turbine main shaft system as described in claim 1, characterized in that: The radial telescopic component (73) includes a movable block (731), on which a screw (732) is screwed into the radial inner side. The screw (732) is rotatably fixed to the first mounting component (71). The first mounting component (71) is provided with a radially extending strip groove. The upper part of the movable block (731) is connected to the strip groove by a third connector (733), which is movable along the strip groove.

7. The assembly method of the rear bearing inner ring of the wind turbine main shaft system as described in claim 6, characterized in that: The movable block (731) has a bearing (736) on its radially outer side via a connecting shaft (735), and the bearing (736) contacts the second mounting assembly (72).

8. The method of assembling the inner ring of the main shaft system rear bearing of a wind turbine generator set as claimed in claim 7, characterized in that: The second mounting assembly (72) is provided with an oil receiving groove (723).

9. The assembly method of the inner ring of the rear bearing of the wind turbine main shaft system as described in claim 1, characterized in that: The pressure plate fixture (9) includes a first pressing surface (91) corresponding to the upper end face of the pad fixture (10) and a second pressing surface (92) corresponding to the upper end face of the inner ring (6) of the rear bearing; the first pressing surface (91) is provided with a first through hole corresponding to the threaded hole of the spindle (2), and a first tensioning bolt is provided in the first through hole; the second pressing surface (92) is provided with a second through hole corresponding to the upper threaded hole of the inner ring (6) of the rear bearing, and a second tensioning bolt is provided in the second through hole.

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