Assembly method for rear bearing inner ring of wind turbine generator main shaft system

Abstract

The invention discloses a method for assembling a rear bearing inner ring of a main shaft system of a wind turbine generator, which comprises the following steps of: hoisting a bearing seat assembly to a main shaft in place, and adjusting the alignment degree of a bearing seat and the main shaft until the requirement is met; measuring the height difference between the end face of the main shaft and the small end face of the rear bearing outer ring, and substituting the value into a formula to calculate the seam allowance height of the product pressing plate. The inner ring of the rear bearing is heated, and the pressing plate tool and the inner ring of the rear bearing are assembled into a whole; a plurality of sets of base plate tools are evenly distributed and installed on the upper end face of the main shaft, the rear bearing inner ring assembly is hoisted to the main shaft in place, the main shaft end face, the base plate tools, the pressing plate tools and the hollow jack are connected, and the jack outputs pressure till the room temperature is recovered; then, the pressing plate tool and the base plate tool are disassembled; and installing the product pressing plate after match grinding, connecting the product pressing plate with the end face of the main shaft, and installing the inner ring of the rear bearing in place. Accurate measurement of data is achieved, and the rear bearing inner ring can be controlled to prevent excessive pressure.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine assembly, in particular to an assembly method for an inner ring of a rear bearing of a main shaft system of a wind turbine. Background Art

[0002] At present, the main shaft system of the wind power semi-direct drive unit is two single-row tapered roller bearings. The commonly used assembly process is as follows:

[0003] (1) Install the inner ring of the front bearing on the main shaft.

[0004] (2) Install the front bearing outer ring and the rear bearing outer ring into place on the bearing seat.

[0005] (3) Lift the bearing seat assembly (including the bearing seat and two outer rings) onto the main shaft and place it in place.

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

[0007] (5) Evenly place multiple sets of pad tooling on the spindle end face, and hoist the product pressure plate onto the pad tooling. Evenly install multiple sets of threaded fasteners to connect the product pressure plate, pad tooling and spindle end face, install a hollow hydraulic jack on the threaded fasteners, and simultaneously press down the product pressure plate, and then press down the inner ring of the rear bearing until it returns to room temperature.

[0008] (6) Remove the product pressure plate and pad tooling, measure the height difference between the main shaft end face and the small end face of the rear bearing outer ring, and substitute this value into the formula to calculate the stop height of the product pressure plate, that is, the height difference between the main shaft 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) Grind the stop height of the 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) There is an interference fit between the inner ring of the rear bearing and the main shaft. The radial pressure generated by the interference causes the end face of the main shaft to deform. This deformation affects the measurement accuracy 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.

[0013] (2) The above operation uses the product pressure plate to press down the inner ring of the rear bearing for centering, that is, the rear bearing outer ring is aligned through the rear bearing inner ring. It cannot guarantee that the inner ring of the rear bearing and the main shaft are well aligned. The alignment degree can be measured by the deviation of the eight-point height difference between the main shaft end face and the large end face of the rear bearing inner ring. If the deviation is too large, the local clearance between the rear bearing inner ring roller and the rear bearing outer ring raceway will be negative, that is, the inner ring has 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, the inner ring is skewed on the main shaft, which will also cause the inner ring roller and the outer ring raceway to be damaged by excessive local force when the product pressure plate is installed after grinding.

[0014] (3) If the thickness of the backing plate fixture is not selected appropriately, there is a risk that the inner ring will be over-pressed before the data is measured, 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 the present invention is to provide an assembly method for the inner ring of the rear bearing of the main shaft system of a wind turbine set in response to the above-mentioned problems, which can adjust the alignment between the bearing seat and the main shaft until the requirements are met and then measure the height difference between the main shaft end face and the small end face of the rear bearing outer ring, thereby achieving accurate measurement of data and controlling the inner ring of the rear bearing to prevent excessive pressure.

[0016] The technical solution adopted by the present invention is as follows:

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

[0018] Step 1: Install the inner ring of the front bearing on the main shaft;

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

[0020] Step 3: Lift the bearing seat assembly onto the main shaft and adjust the alignment between the bearing seat and the main shaft until the requirements are met;

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

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

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

[0024] Step 7, evenly install multiple sets of pad tooling on the upper end face of the main shaft, hoist the rear bearing inner ring assembly to place it on the main shaft, connect the main shaft end face, pad tooling, pressure plate tooling and hollow jack, and make the jack output pressure until it returns to room temperature;

[0025] Step 8: Disassemble the pressing plate tooling and the pad tooling;

[0026] Step 9: Install the grinded product pressure plate, connect the product pressure plate with the spindle end face, and install the inner ring of the rear bearing in place.

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

[0028] Optionally, in step 3, the alignment between the bearing seat and the main shaft is adjusted by a guide tool; the guide tool includes a first mounting component installed on the bearing seat and a second mounting component installed on the main shaft, and a plurality of radial telescopic components are connected to the first mounting component, and the radial telescopic components are in contact with the second mounting component to adjust the radial offset of the main shaft.

[0029] Optionally, the step 3 includes the following steps:

[0030] Step 3.1, install the first installation component of the guide tooling on the bearing seat, and install the second installation component of the guide tooling on the main shaft;

[0031] Step 3.2, hoist the bearing seat assembly onto the main shaft;

[0032] Step 3.3, adjust the radial telescopic assembly of the guide fixture so that its bearing surface contacts the positioning cylindrical surface of the spindle part, rotate the bearing seat, and continuously adjust the radial telescopic assembly until the alignment degree between the bearing seat and the spindle meets the requirements.

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

[0034] Optionally, the second mounting assembly includes a positioning ring mounted on the upper portion of the main shaft, the outer periphery of the positioning ring being connected to the main shaft via a second connecting member; a positioning annular surface is provided inside the positioning ring, and the positioning annular surface is in contact with the radial telescopic assembly.

[0035] Optionally, the radial telescopic assembly includes a moving block, a screw is screwed on the radial inner side of the moving block, and the screw can be rotatably fixed on the first mounting assembly; the first mounting assembly is provided with a strip groove extending radially, and the upper part of the moving block is connected to the strip groove by a third connecting member, and the third connecting member can move along the strip groove.

[0036] Optionally, the radial outer side of the moving block has an arc support surface.

[0037] Optionally, a bearing is provided on the radial outer side of the moving block via a connecting shaft, and the bearing is in contact with the second mounting assembly.

[0038] Optionally, an oil collecting groove is provided in the second mounting assembly.

[0039] Optionally, the pressure plate tooling includes a first clamping surface corresponding to the upper end surface of the pad tooling and a second clamping surface corresponding to the upper end surface of the inner ring of the rear bearing; the first clamping surface is provided with a first through hole corresponding to the threaded hole of the main shaft, and the first through hole is provided with a first tightening bolt; the second clamping surface is provided with a second through hole corresponding to the upper threaded hole of the inner ring of the rear bearing, and the second through hole is provided with a second tightening bolt.

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

[0041] 1. The present invention provides a method for assembling the inner ring of the rear bearing of a wind turbine main shaft system, which can adjust the alignment between the bearing seat and the main shaft to ensure accurate alignment between the bearing seat and the main shaft. It can avoid measurement errors caused by poor alignment. It can also measure the height difference between the main shaft end face and the small end face of the rear bearing outer ring in advance, when the rear bearing inner ring has not yet been installed, thus avoiding measurement errors caused by interference fit of the inner ring.

[0042] 2. The present invention provides a method for assembling the inner ring of the rear bearing of a wind turbine main shaft system. By assembling the pressure plate fixture and the inner ring of the rear bearing into one body, the downward pressure of the inner ring can be effectively controlled to prevent the local excessive force damage to the inner ring of the bearing caused by excessive downward pressure. The installation pressure of the inner ring is accurately controlled to avoid deformation of the main shaft end face caused by the radial pressure generated by the interference fit. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0048] Markings in the figure: 1-bearing seat, 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-positioning ring, 7211-positioning annular surface, 7212-second bottom surface, 7213-second side surface, 722-second connecting piece, 723-oil collecting groove, 73-radial telescopic assembly, 731-moving block, 732-screw, 733-third connecting piece, 734-arc supporting surface, 735-connecting shaft, 736-bearing, 8-product pressing plate, 9-pressing plate tooling, 91-first clamping surface, 92-second clamping surface, 10-pad tooling. DETAILED DESCRIPTION

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings.

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

[0051] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

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

[0053] Step 1: Install the front bearing inner ring 3 on the main shaft 2;

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

[0055] Step 3: hoist the bearing seat 1 assembly onto the main shaft 2, and adjust the alignment between the bearing seat 1 and the main shaft 2 until the requirements are met;

[0056] Step 4, measure the height difference between the end face of the main shaft 2 and the small end face of the rear bearing outer ring 5, and use this value to substitute into the formula to calculate the stop height of the product pressing plate 8;

[0057] Step 5, grinding the stop height of the product pressing plate 8 according to the calculation result;

[0058] Step 6, heating the rear bearing inner ring 6, and assembling the pressing plate fixture 9 and the rear bearing inner ring 6 into one body;

[0059] Step 7, evenly install multiple sets of pad tooling 10 on the upper end surface of the main shaft 2, hoist the rear bearing inner ring 6 assembly to position on the main shaft 2, connect the end surface of the main shaft 2, the pad tooling 10, the pressure plate tooling 9 and the hollow jack, and make the jack output pressure until the room temperature is restored;

[0060] Step 8, disassembling the pressing plate tooling 9 and the backing plate tooling 10;

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

[0062] In step 3, after the bearing seat 1 assembly is hoisted and placed on the spindle 2, the alignment between the bearing seat 1 and the spindle 2 is immediately adjusted, so that before measuring the height difference, the bearing seat 1 and the spindle 2 are already in the correct relative position, avoiding the measurement error caused by poor alignment in the subsequent steps. In step 4, the height difference between the end face of the spindle 2 and the small end face of the rear bearing outer ring 5 is measured. At this time, since the alignment has been adjusted, the measurement result is more accurate. In step 6, the pressure plate fixture 9 and the rear bearing inner ring 6 are assembled into one body, so that the pressure plate fixture 9 can play a role of both pressing and pulling the rear bearing inner ring 6 in subsequent operations, ensuring that the rear bearing inner ring 6 will not deviate from the axis relative to the spindle 2 during heating and installation. In step 7, the hollow jack is used to output pressure, which can accurately control the installation pressure of the rear bearing inner ring 6 and avoid deformation of the spindle 2 end face caused by the radial pressure generated by the interference fit.

[0063] As another specific implementation, in step 3, the degree of alignment is measured by the deviation of the eight-point height difference between the end face of the main shaft 2 and the large end face of the rear bearing inner ring 6. These eight points are usually evenly distributed on the circumference of the bearing inner ring, and each point represents the alignment in one direction. By comparing the height difference of these eight points, the alignment deviation between the end face of the main shaft 2 and the large end face of the bearing inner ring can be analyzed. After measuring the eight-point height difference, if it is found that the deviation exceeds the allowable range, the bearing seat 1 needs to be fine-tuned until the height difference of all eight points is within an acceptable range. Ensure accurate alignment of the bearing inner ring and the main shaft 2. Specifically, the deviation should generally be less than 0.05mm.

[0064] As another specific implementation, in step 3, the alignment between the bearing seat 1 and the main shaft 2 is adjusted by a guide fixture 7; the guide fixture 7 includes a first mounting assembly 71 mounted on the bearing seat 1 and a second mounting assembly 72 mounted on the main shaft 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 seat 1. The first mounting assembly 71 is mounted on the bearing seat 1, and is used to fix and support the radial telescopic assemblies 73. The radial telescopic assemblies 73 are connected to the first mounting assembly 71, and can contact the second mounting assembly 72 and generate radial force to adjust the radial position of the bearing seat 1. The second mounting assembly 72 is mounted on the main shaft 2, and interacts with the radial telescopic assemblies 73 of the first mounting assembly 71, thereby driving the bearing seat 1 to move and adjust the position of the bearing seat 1. By adjusting the radial telescopic assemblies 73, the radial position of the bearing seat 1 can be fine-tuned, that is, the offset of the bearing seat 1 relative to the main shaft 2 can be adjusted. These telescopic assemblies can be screw jacks, hydraulic cylinders or other devices that can provide precise radial forces. During the adjustment process, the operator measures the relative positions of the spindle 2 and the bearing seat 1 to ensure that they achieve the alignment accuracy required by the design.

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

[0066] Step 3.1, install the first installation component 71 of the guide tool 7 on the bearing seat 1, and install the second installation component 72 of the guide tool 7 on the main shaft 2;

[0067] Step 3.2, hoist the bearing seat 1 assembly to the main shaft 2;

[0068] Step 3.3, adjust the radial telescopic assembly 73 of the guide fixture 7 so that its bearing surface contacts the positioning cylindrical surface of the main shaft 2, rotate the bearing seat 1, and continuously adjust the radial telescopic assembly 73 until the alignment degree between the bearing seat 1 and the main shaft 2 meets the requirements.

[0069] Through the fine adjustment of the radial telescopic assembly 73, the bearing seat 1 can be accurately aligned with the main shaft 2, and by measuring the height difference in advance, the interference fit between the rear bearing inner ring 6 and the main shaft 2 is avoided, which may cause the end face of the main shaft 2 to deform and affect the measurement accuracy, thereby improving the accuracy of the measurement data. In addition, since this solution can ensure good alignment between the rear bearing inner ring 6 and the main shaft 2, the risk of damage caused by excessive local force on the inner ring roller and the outer ring raceway is reduced.

[0070] As another specific embodiment, the first mounting assembly 71 includes a support plate 711 mounted on the upper part of the bearing seat 1, and the support plate 711 is connected to the bearing seat 1 through a first connecting member 712; a connecting plate is provided below the support plate 711, and the connecting plate is connected to the radial telescopic assembly 73; a rib plate 714 is provided between the connecting plate and the support plate 711. Specifically, the support plate 711 is in a "cross" shape; the first bottom surface 7111 of the support plate 711 is engaged with the upper end surface of the bearing seat 1, and the first side surface 7112 of the support plate 711 is matched with the inner ring surface of the bearing seat 1; the connecting plate has an axial positioning portion 715 and a radial positioning portion 713 for axially and radially positioning the radial telescopic assembly 73 respectively. The support plate 711 is located on the upper part of the bearing seat 1 to provide support for the entire first mounting assembly 71. The first connecting member 712 is used to fix the support plate 711 to the bearing seat 1, and can be a bolt. Through the first connecting member 712, the support plate 711 can be conveniently installed on the bearing seat 1. The connecting plate is located below the support plate 711 and is connected to the radial telescopic assembly 73 for transmitting radial force. The rib plate 714 is arranged between the support plate 711 and the connecting plate to enhance the structural strength and stability of the entire first mounting assembly 71. The support plate 711 of the "cross" structure provides four independent adjustment points in the annular direction, which are evenly distributed around the bearing seat 1 to form a 90-degree interval. Such a layout can ensure that when adjusting the main shaft 2, the main shaft 2 can be evenly pushed and pulled from four different directions, thereby achieving precise alignment. The first bottom surface 7111 of the support plate 711 is engaged with the upper end surface of the bearing seat 1, which provides a stable support base for the support plate 711 and ensures that the support plate 711 will not move or tilt during the entire adjustment process. The first side surface 7112 of the support plate 711 cooperates with the inner annular surface of the bearing seat 1 to help prevent the support plate 711 from shifting in the radial direction. The axial positioning portion 715 is a horizontal plate, which contacts the top or bottom of the radial telescopic assembly 73 and is connected to the assembly by fixing bolts or other fasteners to prevent axial displacement. The radial positioning portion 713 is a vertical plate, which is fixedly connected to the fixed end of the radial telescopic assembly 73 to ensure the correct position of the assembly in the radial direction. The design of the axial positioning portion 715 and the radial positioning portion 713 increases the overall rigidity of the connecting plate and enhances the connection stability of the radial telescopic assembly 73 and the connecting plate.

[0071] As another specific embodiment, as another specific embodiment, the second mounting assembly 72 includes a positioning ring 721 installed on the upper part of the main shaft 2, and the outer periphery of the positioning ring 721 is connected to the main shaft 2 through a second connecting member 722; the interior of the positioning ring 721 is provided with a positioning annular surface 7211, and the positioning annular surface 7211 contacts the radial telescopic assembly 73. The positioning ring 721 is connected to the main shaft 2 through a second connecting member 722 (such as a bolt, a clamping device, etc.), ensuring that the positioning ring 721 is firmly fixed on the main shaft 2. Since the positioning ring 721 is fixed on the main shaft 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 in the main shaft 2. The design of the positioning ring 721 can prevent the radial telescopic assembly 73 from directly contacting the main shaft 2, thereby avoiding damage to the surface of the main shaft 2. Specifically, the second bottom surface 7212 of the positioning ring 721 is engaged with the upper end surface of the main shaft 2, and the second side surface 7213 of the positioning ring 721 is matched with the inner ring surface of the main shaft 2. The second bottom surface 7212 of the positioning ring 721 is engaged with the upper end surface of the main shaft 2 to ensure the axial positioning of the positioning ring 721 on the main shaft 2, and the second side surface 7213 of the positioning ring 721 is matched with the inner ring surface of the main shaft 2 to provide radial positioning, prevent the relative movement of the positioning ring 721 during the assembly process, and ensure the assembly accuracy.

[0072] As another specific embodiment, the radial telescopic assembly 73 includes a moving block 731, and a screw 732 is screwed on the radial inner side of the moving block 731, and the screw 732 is rotatably fixed on the first mounting assembly 71; the first mounting assembly 71 is provided with a strip groove extending in the radial direction, and the upper part of the moving block 731 is connected to the strip groove by a third connecting member 733, and the third connecting member 733 can move along the strip groove. The moving block 731 is the core part of the radial telescopic assembly 73, and it can move radially on the first mounting assembly 71 to adjust the position of the main shaft 2. By rotating the screw 732, the moving block 731 can move radially in the strip groove, thereby adjusting the relative position between the main shaft 2 and the bearing seat 1 to achieve precise alignment. The design of the strip groove allows the moving block 731 to move radially in the groove, while limiting its movement in other directions. The third connecting member 733 is used to connect the upper part of the moving block 731 with the strip groove, allowing the moving block 731 to move along the strip groove, which can be a bolt. Furthermore, the radial outer side of the moving block 731 has an arc support surface 734. Due to the shape of the arc surface, when the moving block 731 is subjected to radial force, the point of action of the moment will be located on the center line of the arc surface, which helps to maintain the balance of the moving block 731 and reduce tilt and offset.

[0073] As another specific embodiment, a bearing 736 is provided on the radial outer side of the moving block 731 through 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 moving block 731 can be converted into a rotational movement through the bearing 736, thereby reducing the sliding friction between the positioning annular surface 7211 of the positioning ring 721 and the moving block 731.

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

[0075] As another specific embodiment, the pressure plate fixture 9 includes a first pressing surface 91 corresponding to the upper end surface of the backing plate fixture 10 and a second pressing surface 92 corresponding to the upper end surface of the rear bearing inner ring 6; the first pressing surface 91 is provided with a first through hole corresponding to the threaded hole of the main shaft 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 rear bearing inner ring 6, and a second tensioning bolt is provided in the second through hole. When the first tensioning bolt is tightened through the first through hole, it presses the pressure plate fixture 9 on the backing plate fixture 10, and the backing plate fixture 10 is pressed on the end surface of the main shaft 2, thereby forming a pressure transmission path from the pressure plate fixture 9 to the end surface of the main shaft 2. At the same time, when the second tensioning bolt is tightened through the second through hole, it pulls the rear bearing inner ring 6 toward the pressure plate fixture 9, thereby forming a tension transmission path from the pressure plate fixture 9 to the rear bearing inner ring 6. This design enables the pressure plate fixture 9 to simultaneously apply a pressing force and a tensile force to the rear bearing inner ring 6. The pressing force ensures a tight fit between the rear bearing inner ring 6 and the main shaft 2, while the tensile force helps to correctly position the rear bearing inner ring 6 on the main shaft 2, thereby avoiding the displacement of the installation axis of the rear bearing inner ring 6 due to heating expansion.

[0076] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A method for assembling the inner ring of the rear bearing of a main shaft system of a wind turbine generator set, characterized in that: The following steps are involved: Step 1: Install the front bearing inner ring (3) on the main shaft (2); Step 2: Install the front bearing outer ring (4) and the rear bearing outer ring (5) on the bearing seat (1); Step 3: hoist the bearing seat (1) assembly onto the main shaft (2) and adjust the alignment between the bearing seat (1) and the main shaft (2) until the requirements are met; Step 4, measure the height difference between the end face of the main shaft (2) and the small end face of the outer ring of the rear bearing (5), and use this value to substitute into the formula to calculate the stop height of the product pressure plate (8); Step 5, grinding the stop height of the product pressing plate (8) according to the calculation result; Step 6, heating the rear bearing inner ring (6), and assembling the pressing plate fixture (9) and the rear bearing inner ring (6) into one body; Step 7, evenly install multiple sets of pad tooling (10) on the upper end surface of the main shaft (2), hoist the rear bearing inner ring (6) assembly to its position on the main shaft (2), connect the end surface of the main shaft (2), the pad tooling (10), the pressure plate tooling (9) and the hollow jack, and make the jack output pressure until the room temperature is restored; Step 8, disassembling the pressing plate tooling (9) and the backing plate tooling (10); Step 9: Install the product pressure plate (8) after grinding, connect the product pressure plate (8) with the end face of the main shaft (2), and install the rear bearing inner ring (6) in place.

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

3. The method for assembling the inner ring of the rear bearing of the main shaft system of a wind turbine generator set according to claim 1, characterized in that: In step 3, the alignment between the bearing seat (1) and the main shaft (2) is adjusted by a guide fixture (7); the guide fixture (7) includes a first mounting component (71) mounted on the bearing seat (1) and a second mounting component (72) mounted on the main shaft (2), and the first mounting component (71) is connected to a plurality of radial telescopic components (73), and the radial telescopic components (73) are in contact with the second mounting component (72) to adjust the radial offset of the bearing seat (1).

4. The method for assembling the inner ring of the rear bearing of the main shaft system of a wind turbine generator set according to claim 3, characterized in that: The step 3 includes the following steps: Step 3.1, installing the first mounting assembly (71) of the guide fixture (7) on the bearing seat (1), and installing the second mounting assembly (72) of the guide fixture (7) on the main shaft (2); Step 3.2, hoist the bearing seat (1) assembly onto the main shaft (2) and place it in place; Step 3.3, adjust the radial telescopic assembly (73) of the guide fixture (7) so that its bearing surface contacts the positioning cylindrical surface of the main shaft (2), rotate the bearing seat (1), and continuously adjust the radial telescopic assembly (73) until the alignment degree between the bearing seat (1) and the main shaft (2) meets the requirements.

5. The method for assembling the inner ring of the rear bearing of the main shaft system of a wind turbine generator set according to claim 3, characterized in that: The first mounting assembly (71) comprises a support plate (711) mounted on the upper part of the bearing seat (1), wherein the support plate (711) is connected to the bearing seat (1) via a first connecting member (712); a connecting plate is provided below the support plate (711), wherein the connecting plate is connected to the radial telescopic assembly (73); and a rib plate (714) is provided between the connecting plate and the support plate (711).

6. The method for assembling the inner ring of the rear bearing of the main shaft system of a wind turbine generator set according to claim 3, characterized in that: The second mounting assembly (72) comprises a positioning ring (721) mounted on the upper part of the main shaft (2), the outer periphery of the positioning ring (721) being connected to the main shaft (2) via a second connecting member (722); a positioning annular surface (7211) is provided inside the positioning ring (721), and the positioning annular surface (7211) is in contact with the radial telescopic assembly (73).

7. The method for assembling the inner ring of the rear bearing of the main shaft system of a wind turbine generator set according to claim 3, characterized in that: The radial telescopic component (73) comprises a moving block (731), a screw rod (732) being screwed on the radial inner side of the moving block (731), and the screw rod (732) being rotatably fixed on the first mounting component (71); the first mounting component (71) is provided with a strip groove extending in the radial direction, and the upper part of the moving block (731) is connected to the strip groove by a third connecting member (733), and the third connecting member (733) can move along the strip groove.

8. The method for assembling the inner ring of the rear bearing of the main shaft system of a wind turbine generator set according to claim 7, characterized in that: A bearing (736) is provided on the radial outer side of the moving block (731) via a connecting shaft (735), and the bearing (736) is in contact with the second mounting assembly (72).

9. The method for assembling the inner ring of the rear bearing of the main shaft system of a wind turbine generator set according to claim 8, characterized in that: An oil receiving groove (723) is provided in the second mounting assembly (72).

10. The method for assembling the inner ring of the rear bearing of the main shaft system of a wind turbine generator set according to claim 1, characterized in that: The pressure plate fixture (9) comprises a first clamping surface (91) corresponding to the upper end surface of the pad fixture (10) and a second clamping surface (92) corresponding to the upper end surface of the rear bearing inner ring (6); the first clamping surface (91) is provided with a first through hole corresponding to the threaded hole of the main shaft (2), and a first tightening bolt is provided in the first through hole; the second clamping surface (92) is provided with a second through hole corresponding to the upper threaded hole of the rear bearing inner ring (6), and a second tightening bolt is provided in the second through hole.

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