Modular wind turbine nacelle main frame load bearing structure

Abstract

This invention discloses a modular wind turbine nacelle main frame support structure, relating to the field of wind power generation technology. It includes a support base frame, with a top plate fixedly installed at the upper end. An intelligent dynamic tilt sensor is installed at the bottom of the support base frame. Horizontal plates are symmetrically installed on the right side of the bottom of the support base frame. A screw rod and a sliding rod are rotatably installed below the left and right horizontal plates, respectively. The left screw rod is slidably connected to a slider via an outer spiral groove. The rear shaft of the left screw rod is connected to the horizontal plate via a motor. By configuring the cooperation between screw rods and the adjusting components, the wind turbine's center of gravity is actively adjusted during swaying, counteracting the overturning moment in strong winds. This reduces the cooperation between the support base frame, the adjusting components, and the hydraulic components, enabling dynamic adjustment of the damping strength. Under strong wind conditions, this stabilizes the transmission equipment, avoids eccentric load wear, and buffers vibrations during normal operation, making it suitable for multiple operating conditions.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, specifically to a modular wind turbine nacelle main frame load-bearing structure. Background Technology

[0002] Wind turbines are the core equipment for clean energy power generation. The main frame of the nacelle serves as the foundation for the main shaft bearings, main shaft, gearbox, generator, and other core transmission equipment. Its stability, vibration reduction performance, and balance adjustment capabilities directly affect the overall operational safety and service life of the unit.

[0003] However, the traditional modular wind turbine nacelle main frame structure currently has a single function and is not suitable for adapting to complex and harsh outdoor conditions such as strong winds, turbulence, and gusts. It suffers from numerous technical drawbacks in actual operation. In traditional nacelle support frames, the aerodynamic load generated by the wind turbine blades being impacted by strong winds is transmitted step-by-step through the hub, main shaft bearings, main shaft, gearbox, and generator to the support frame, causing the tower to tilt and sway continuously. Furthermore, the traditional structure has poor center of gravity adjustment capabilities and cannot easily compensate for the reverse center of gravity based on the direction and amplitude of the tower's sway, making it difficult to counteract the effects of strong winds. The horizontal thrust and overturning moment result in poor overall stability of the nacelle and significant excessive tower sway. In addition, the wind turbine hub, main shaft, and various transmission equipment are arranged coaxially. Under strong wind conditions, the unit is prone to tilting and shifting along the coaxial direction. Traditional vibration damping structures are not convenient for dynamically adjusting the damping intensity and locking the equipment attitude according to the operating conditions. Continuous swaying will cause the transmission chain equipment to be subjected to eccentric loads, alternating radial and axial forces for a long time, which will lead to mechanical failures such as unilateral bearing wear, fatigue pitting, gear tooth surface wear, and journal scoring, significantly increasing operation and maintenance costs and shortening the service life of the equipment.

[0004] To address the aforementioned issues, innovative designs are urgently needed based on existing approaches. Summary of the Invention

[0005] The purpose of this invention is to provide a modular wind turbine nacelle main frame load-bearing structure to solve the problems mentioned in the background. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a modular wind turbine nacelle main frame support structure, including a support base frame, a top plate fixedly installed on the upper end of the support base frame, an intelligent dynamic tilt sensor installed at the bottom of the support base frame, a horizontal plate symmetrically installed on the right section of the bottom of the support base frame, a screw rod and a sliding rod rotatably installed below the left and right horizontal plates respectively, a slider is slidably connected to the left screw rod through an outer spiral groove, the rear shaft of the left screw rod is connected to the horizontal plate through a motor, a slider is slidably connected to the outer side of the right sliding rod, a screw rod is rotatably installed between the two sliders, the left shaft of the screw rod is connected to the left slider through a motor, an adjustment component is provided on the outer side of the screw rod, multiple mounting blocks are symmetrically installed at the upper end of the top plate, a fixed plate is provided above each mounting block, mounting slots are symmetrically opened in the mounting blocks, a movable plate is vertically slidably installed at the bottom of the mounting slot, a top column is symmetrically installed at the upper end of the movable plate, and a shock-absorbing component is provided between the top column and the fixed plate; The oil component is disposed between the mounting block and the screw.

[0007] Optionally, the top plate is provided with a main shaft bearing, a main shaft, a gearbox and a generator, etc., sequentially from left to right, and each of the fixed plates is connected to the fixed installation position of each device on the top plate by bolts.

[0008] Optionally, the adjusting assembly includes a slide tube, which is slidably connected to the outer spiral groove of the screw. A limit rod is slidably installed inside the through hole of the slide tube, and the two ends of the limit rod are fixed between two sliders. A counterweight column is connected to the outer side of the slide tube by multiple circumferentially equidistant springs.

[0009] Optionally, the shock absorption assembly includes an adjusting ring, which is vertically limited and slidably mounted on the upper section of the mounting groove. A rubber block is abutted and connected inside the adjusting ring, and the rubber block is vertically slidably mounted on the upper section of the mounting groove. A connecting column is vertically slidably mounted inside the circular hole of the rubber block. A fixing plate is fixed to the top of the two connecting columns, and a moving plate is connected to the bottom of the connecting columns by a spring. The bottom of the adjusting ring abuts against the top column.

[0010] Optionally, the top of the rubber block protrudes above the mounting groove, and the lower outer side of the rubber block is designed as a cylindrical conical inclined surface structure, with the contact surface between the adjusting ring and the rubber block corresponding to the cylindrical conical inclined surface structure of the rubber block.

[0011] Optionally, the oil assembly includes a top block fixed to the bottom of the movable plate. Each top block has a corresponding mounting groove at its bottom that abuts against a corresponding notch above the movable rod. The movable rod is slidably installed in the transverse groove of the mounting block. A stopper rod is connected to the right side of the movable rod. The stopper rod is slidably connected to an oil rod by a spring seal. The oil rod is installed on the right side of the groove at the bottom of the mounting block.

[0012] Optionally, the bottom of the top block is designed as a sloping structure, and the sloping structure at the notch above the moving rod corresponds to the sloping structure at the bottom of the top block.

[0013] Optionally, the oil assembly further includes a fixed bracket installed at the right end of the right slider. An oil rod two is fixed in a groove below the fixed bracket. A sliding column is connected to the oil rod two by a spring. The sliding column is slidably and sealingly positioned inside the oil rod two. A screw three is helically slidably connected to the left side of the sliding column. The section of the screw three without a helical groove is rotatably and sealingly connected to the oil rod two. The left end of the screw three is fixedly connected to the right end of the screw two.

[0014] Optionally, the inner cavity of the second oil rod is connected to multiple first oil rods via a right-side port distributor and multiple hoses.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention relates to a modular wind turbine nacelle main frame load-bearing structure. Utilizing a shock-absorbing assembly consisting of a fixed plate, connecting columns, rubber blocks, and matching springs, the structure allows for the matching of elastic components to different equipment loads on the top plate. Shock absorption is achieved through spring compression and rubber block deformation, reducing vibrations generated during equipment operation. When strong winds cause the wind turbine load to be transmitted to the load-bearing base frame via transmission components, resulting in tower tilting and swaying, the system drives screws one and two to rotate after receiving data from the dynamic tilt sensor. This drives the slider, slide tube, and counterweight column to move along the sliding and limit rods, respectively, adjusting the overall center of gravity in multiple dimensions (front-to-back, left-to-right) to effectively suppress the swaying amplitude of the load-bearing base frame and tower, significantly improving the overall operational stability of the unit.

[0016] This invention addresses the problem of coaxial tilting in transmission chains under strong winds. The system can pre-drive the coordinated operation of screws two and three, using a hydraulic rod distributor and hose to supply oil to hydraulic rod one, pushing the stopper rod and moving rod to slide. This, in turn, drives the moving plate and top column upwards via the top block. On one hand, this further compresses the springs and reduces the deformation of the rubber blocks, weakening the shock absorption capacity and strengthening the fixation effect of various transmission devices on the fixed plate. This prevents the main shaft bearings, main shaft, gearbox, and generator from experiencing uneven loads and alternating forces due to horizontal wind loads and overturning moments, eliminating unilateral bearing wear, fatigue pitting, and wear and tear on gears and journals. On the other hand, vibrations from equipment operation can be transmitted to the sliding tube via the top plate, cross plate, and slider, and then buffered and absorbed by the elastic structure between the sliding tube and the counterweight column, balancing equipment stability and vibration suppression requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall front view of the present invention; Figure 2 This is a schematic diagram of the overall rear view structure of the present invention; Figure 3 This is a schematic diagram of the disassembled structure of the supporting base frame, top plate, and cross plate of the present invention; Figure 4 This is a schematic diagram of the structure of the horizontal plate, screw one, slide bar, slider, screw two and adjustment assembly of the present invention; Figure 5 This is a schematic diagram of the disassembled structure of the adjustment component of the present invention; Figure 6 This is a cross-sectional view of the oil component of the present invention. Figure 7 This is a cross-sectional view of the regulating component and the oil component of the present invention.

[0018] In the diagram: 1. Supporting base frame; 2. Top plate; 3. Horizontal plate; 4. Screw 1; 41. Slide rod; 5. Slider; 6. Screw 2; 7. Adjusting assembly; 71. Counterweight column; 72. Slide tube; 73. Limiting rod; 8. Mounting block; 81. Mounting groove; 9. Shock absorption assembly; 91. Adjusting ring; 92. Rubber block; 93. Connecting column; 10. Fixed plate; 11. Moving plate; 12. Top column; 13. Hydraulic assembly; 131. Hydraulic rod 1; 132. Plug rod; 133. Moving rod; 134. Top block; 135. Fixed section; 136. Hydraulic rod 2; 137. Slide column; 138. Screw 3. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention. Example 1

[0020] Please see Figures 1 to 7 This invention provides a technical solution: a modular wind turbine nacelle main frame support structure, including a support base frame 1. A top plate 2 is fixedly installed on the upper end of the support base frame 1. From left to right, the top plate 2 is sequentially and linked with equipment such as a main shaft bearing, a main shaft, a gearbox, and a generator. An intelligent dynamic tilt sensor is installed at the bottom of the support base frame 1. A horizontal plate 3 is symmetrically installed on the right side of the bottom of the support base frame 1. A screw 4 and a slide rod 41 are rotatably installed below the left and right horizontal plates 3, respectively. The left screw 4 is slidably connected to a slider 5 through an outer spiral groove. The rear shaft of the left screw 4 is connected to the horizontal plate 3 through a motor. The right slide rod 41 is slidably connected to a slider 5 through an outer limit. A screw 6 is rotatably installed between the two sliders 5. The left shaft of the screw 6 is connected to the left slider 5 through a motor. An adjustment mechanism is provided on the outer side of the screw 6. Section component 7, adjustment component 7 includes slide tube 72, slide tube 72 is slidably connected to the outer spiral groove of screw 6, limit rod 73 is slidably installed in the through hole of slide tube 72, the two ends of limit rod 73 are fixed between two sliders 5, counterweight column 71 is connected to the outer side of slide tube 72 by multiple circumferentially equidistant springs, multiple mounting blocks 8 are symmetrically installed at the front and back of the top plate 2, each mounting block 8 is provided with a fixing plate 10 above it, each fixing plate 10 is connected to the fixed installation position of each device at the top of the top plate 2 by bolts, mounting grooves 81 are symmetrically opened in the mounting block 8, a moving plate 11 is vertically slidably installed at the bottom of the mounting groove 81, top column 12 is symmetrically installed at the top of the moving plate 11, shock absorption component 9 is provided between the top column 12 and the fixing plate 10, and oil component 13 is provided between the mounting block 8 and screw 6; When the wind turbine blades encounter strong winds, the hub experiences force, which is transmitted to the supporting base 1 through the main shaft bearing, main shaft, gearbox, and generator. This causes the supporting base 1 to cause the tower connected below to tilt and sway slightly with the strong winds. At this time, the dynamic tilt sensor detects the corresponding tilt direction and amplitude and sends the data to the system in the control panel. After processing by the system algorithm, the motor is started to drive the screw 4 and screw 6 to rotate. The rotation of screw 6 causes the slide tube 72 to move along the fixed direction of the limit rod 73 and adjust in the opposite direction according to the left and right tilt directions. The counterweight column 71 is initially positioned at the center of gravity of the load-bearing base frame 1 in left and right balance. When the screw 4 rotates, it drives the two sliders 5 to move synchronously along the fixed direction of the screw 4 and the slider 41. The counterweight column 71 is adjusted in the opposite direction according to the front and back tilt direction to the initial center of gravity of the load-bearing base frame 1 in front and back balance. With the synchronous adjustment of the position of the counterweight column 71 in front, back, left and right of the system, the position of the counterweight column 71 is accurately adjusted when the load-bearing base frame 1 drives the tower connected below to sway arbitrarily in the circumference. This effectively reduces the sway amplitude of the load-bearing base frame 1 and the tower connected below, and improves stability. Example 2

[0021] Based on Example 1, please refer to Figures 1 to 7 The present invention provides a technical solution: a shock-absorbing component 9 is provided between the top column 12 and the fixing plate 10. The shock-absorbing component 9 includes an adjusting ring 91, which is vertically limited and slidably installed on the upper section of the mounting groove 81. A rubber block 92 is abutted and connected inside the adjusting ring 91. The rubber block 92 is vertically slidably installed on the upper section of the mounting groove 81. The top of the rubber block 92 protrudes above the mounting groove 81. The lower outer side of the rubber block 92 is designed with a cylindrical conical inclined surface structure. The contact surface between the adjusting ring 91 and the rubber block 92 is perpendicular to the cylindrical conical surface of the rubber block 92. Corresponding to the inclined structure, a connecting post 93 is vertically slidably installed inside the round hole of the rubber block 92. A fixing plate 10 is fixed to the top of the two connecting posts 93. A moving plate 11 is connected to the bottom of the connecting posts 93 via a spring. The bottom of the adjusting ring 91 abuts against the top post 12. The oil assembly 13 is located between the mounting block 8 and the screw rod 6. The oil assembly 13 includes a top block 134 fixed to the bottom of the moving plate 11. Each top block 134 has a corresponding mounting groove 81 penetrating its bottom, corresponding to the notch above the moving rod 133. The moving rod 133 is slidably installed in the transverse groove of the mounting block 8. The bottom of the top block 134 is designed with a sloping structure. The sloping structure at the notch above the moving rod 133 corresponds to the sloping structure at the bottom of the top block 134. A stopper rod 132 is connected to the right side of the moving rod 133. The stopper rod 132 is slidably connected to an oil rod 131 by a spring seal. The oil rod 131 is installed on the right side of the bottom groove of the mounting block 8. The oil assembly 13 also includes a fixed bracket 135 installed at the right end of the right slider 5. Oil rod 136 is fixed in the groove below. A slide column 137 is connected to the oil rod 136 by a spring. The slide column 137 is slidably and sealingly positioned in the inner cavity of the oil rod 136. The inner cavity of the oil rod 136 is connected to multiple oil rods 131 through a right-side port distributor and multiple hoses. A screw 138 is helically slidably connected to the left side of the slide column 137. The section of the screw 138 without the helical groove is rotatably and sealingly connected to the oil rod 136. The left end of the screw 138 is fixedly connected to the right end of the screw 136. During the initial installation of equipment such as main spindle bearings, main spindle, gearbox, and generator, it is necessary to match and install corresponding springs between the connecting column 93 and the moving plate 11 according to the load of each piece of equipment on the top plate 2. After the installation and fixing positions of each piece of equipment are fixed with the corresponding fixing plates 10, the equipment with different loads will drive the connecting column 93 to slide on the rubber block 92 through the fixing plate 10, and further squeeze the spring to slide downward until the fixing plate 10 contacts the rubber block 92, so that the rubber block 92 is deformed to the corresponding state under force. Thus, when each piece of equipment on the top plate 2 is running, it will effectively provide corresponding shock absorption effect for each piece of equipment on the top plate 2. When encountering strong winds, because screw 26 is coaxial with the main shaft bearing, main shaft, gearbox, generator, etc., the hub, main shaft bearing, main shaft, gearbox, generator, and other equipment, along with the supporting base 1, are prone to tilting in the coaxial direction first due to horizontal thrust. The system first controls the starter motor to drive screw 26 to rotate. When screw 26 rotates, it synchronously drives screw 3138 to rotate synchronously, causing slide 137 to slide to the corresponding position within oil rod 2136. The oil in oil rod 2136 is then squeezed into the corresponding connected oil rod 131 through a distributor and multiple hoses. The increase in oil in oil rod 131 causes the plug rod 132 and moving rod 133 to move in the mounting groove. The bottom groove of 81 slides to the left, causing the notch of the moving rod 133 to abut against the top block 134, and causing the top block 134 to drive the moving plate 11 and the top column 12 to move upward in the mounting groove 81. The upward movement of the moving plate 11 further compresses the spring between the moving plate 11 and the spring, and increases the corresponding resistance. At the same time, the upward movement of the top column 12, through contact with the outer conical slope of the rubber block 92, further compresses the deformation of the rubber block 92, reduces the shock absorption and buffering effect, and makes the various equipment installed on the fixed plate 10 more stable during tilting and shaking, preventing the transmission chain of the main shaft bearing, main shaft, gearbox and generator from being subjected to eccentric load, alternating radial and axial forces throughout the entire process due to shaking. When the vibration damping component 9 reduces the vibration damping effect, the vibrations of equipment such as the main shaft bearing, main shaft, gearbox and generator during operation will be gradually transmitted to the slide tube 72 through the mounting block 8, top plate 2, horizontal plate 3, screw 1 4, slide rod 41, slider 5 and screw 2 6. At this time, through the elastic connection between the slide tube 72 and the counterweight column 71, the spring deformation between the slide tube 72 and the counterweight column 71 buffers the vibration and reduces the impact of the vibration of each piece of equipment.

[0022] Working principle: When using this modular wind turbine nacelle main frame load-bearing structure, the operator first needs to match and install corresponding springs between the connecting column 93 and the moving plate 11 according to the load of each piece of equipment on the top plate 2. After the fixed positions of each piece of equipment are fixed with the corresponding fixed plates 10, the equipment with different loads will drive the connecting column 93 to slide on the rubber block 92 through the fixed plate 10, and further squeeze the spring to slide downwards until the fixed plate 10 contacts the rubber block 92, so that the rubber block 92 is deformed to the corresponding state under force. Thus, when each piece of equipment on the top plate 2 is running, it effectively provides the corresponding shock absorption effect for each piece of equipment on the top plate 2. Based on the above, when the wind turbine blades encounter strong winds, the hub experiences force, which is transmitted to the supporting base 1 through the main shaft bearing, main shaft, gearbox, and generator. This causes the supporting base 1 to cause the tower connected below to tilt and sway slightly with the strong winds. At this time, the dynamic tilt sensor detects the corresponding tilt direction and amplitude and sends the data to the system in the control panel. After processing by the system algorithm, the motor is started to drive the screw 4 and screw 6 to rotate. The rotation of screw 6 causes the slide tube 72 to move along the fixed direction of the limit rod 73, and the movement is adjusted according to the left and right tilt directions. The counterweight column 71 is initially positioned at the center of gravity of the load-bearing base frame 1 in the left and right balance. When the screw 4 rotates, it drives the two sliders 5 to move synchronously along the fixed direction of the screw 4 and the slider 41. The counterweight column 71 is then adjusted in the opposite direction according to the front and back tilt direction to the initial center of gravity of the load-bearing base frame 1 in the front and back balance. With the synchronous adjustment of the position of the counterweight column 71 in the front, back, left and right of the system, the position of the counterweight column 71 is precisely adjusted when the load-bearing base frame 1 drives the tower connected below to sway arbitrarily in the circumference. This effectively reduces the sway amplitude of the load-bearing base frame 1 and the tower connected below, and improves stability. Based on the above, the blades on the wind turbine hub and the main shaft bearings, main shaft, gearbox, generator, and other equipment are mostly in the same direction. The system controls the yaw pinion to adjust the support frame 1 to the windward direction, so that the blades are in the optimal force direction. At this time, when encountering strong winds, because the screw 2 6 is in the corresponding coaxial direction with the main shaft bearings, main shaft, gearbox, generator, etc., the hub and the main shaft bearings, main shaft, gearbox, generator, etc., along with the support frame 1, are prone to tilting in the same direction first due to horizontal thrust. The system first controls the starter motor to drive the screw 2 6 to rotate. When the screw 2 6 rotates, it synchronously drives the screw 3 138 to rotate synchronously, so that the slide 137 slides to the corresponding position in the oil rod 2 136, and squeezes the oil in the oil rod 2 136 into the corresponding connected oil rod 131 through the distributor and multiple hoses, increasing the amount of oil in the oil rod 131. Slide the stopper rod 132 and the moving rod 133 to the left in the groove at the bottom of the mounting slot 81, so that the notch of the moving rod 133 abuts against the top block 134, and the top block 134 drives the moving plate 11 and the top column 12 to move upward in the mounting slot 81. The upward movement of the moving plate 11 further compresses the spring between the moving plate 11 and the spring increases the corresponding resistance. At the same time, the upward movement of the top column 12 abuts against the outer tapered slope of the rubber block 92, further compressing the deformation of the rubber block 92, reducing the shock absorption and buffering effect, so that the equipment installed on the fixed plate 10 is more stable during tilting and shaking, preventing horizontal wind load and overturning moment from the main shaft bearing, main shaft, gearbox and generator on the bearing base 1 due to shaking, which would cause the transmission chain to be subjected to eccentric load, alternating radial and axial forces throughout the entire process, preventing bearing unilateral wear and fatigue pitting, as well as gear tooth surface wear and journal scoring; Based on the above, when the damping component 9 reduces the damping effect, the vibration of the main shaft bearing, main shaft, gearbox and generator during operation will be gradually transmitted to the slide tube 72 through the mounting block 8, top plate 2, cross plate 3, screw 1 4, slide rod 41, slider 5 and screw 2 6. At this time, through the elastic connection between the slide tube 72 and the counterweight column 71, the spring deformation between the slide tube 72 and the counterweight column 71 buffers the vibration and reduces the impact of the vibration of each piece of equipment.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A modular wind turbine nacelle main frame load-bearing structure, comprising a load-bearing base frame (1), characterized in that: A top plate (2) is fixedly installed on the upper end of the support base (1). An intelligent dynamic tilt sensor is installed at the bottom of the support base (1). A horizontal plate (3) is symmetrically installed on the right side of the bottom of the support base (1). A screw (4) and a slide rod (41) are rotatably installed below the two horizontal plates (3) respectively. The screw (4) on the left side is slidably connected to a slider (5) through an outer spiral groove. The rear shaft of the screw (4) on the left side is connected to the horizontal plate (3) through a motor. The slider (5) is slidably connected to the outer side of the slide rod (41) on the right side. A screw is rotatably installed between the two sliders (5). Second (6), the left shaft of the second screw (6) is connected to the left slider (5) via a motor. An adjustment component (7) is provided on the outside of the second screw (6). Multiple mounting blocks (8) are symmetrically installed on the upper end of the top plate (2). A fixing plate (10) is provided above each mounting block (8). Mounting grooves (81) are symmetrically opened in the mounting block (8). A moving plate (11) is vertically slidably installed at the bottom of the mounting groove (81). A top column (12) is symmetrically installed on the upper end of the moving plate (11). A shock-absorbing component (9) is provided between the top column (12) and the fixing plate (10). Oil assembly (13), which is disposed between mounting block (8) and screw two (6); The top plate (2) is provided with a main shaft bearing, main shaft, gearbox and generator equipment in sequence from left to right. Each of the fixed plates (10) is connected to the fixed installation position of each equipment on the top plate (2) by bolts. The adjustment assembly (7) includes a slide tube (72), which is slidably connected to the outer spiral groove of the screw (6). A limit rod (73) is slidably installed in the through hole of the slide tube (72). The two ends of the limit rod (73) are fixed between two sliders (5). A counterweight column (71) is connected to the outside of the slide tube (72) by multiple circumferentially equidistant springs. The shock absorption assembly (9) includes an adjusting ring (91), which is vertically limited and slidably installed on the upper section of the mounting groove (81). A rubber block (92) is abutted and connected inside the adjusting ring (91). The rubber block (92) is vertically slidably installed on the upper section of the mounting groove (81). A connecting column (93) is vertically slidably installed inside the round hole of the rubber block (92). A fixing plate (10) is fixed on the top of the two connecting columns (93). A moving plate (11) is connected to the bottom of the connecting column (93) by a spring. The bottom of the adjusting ring (91) abuts against the top column (12).

2. The modular wind turbine nacelle main frame load-bearing structure according to claim 1, characterized in that: The top of the rubber block (92) protrudes above the mounting groove (81), and the lower outer side of the rubber block (92) is designed as a cylindrical conical inclined surface structure. The contact surface between the adjusting ring (91) and the rubber block (92) corresponds to the cylindrical conical inclined surface structure of the rubber block (92).

3. The modular wind turbine nacelle main frame load-bearing structure according to claim 1, characterized in that: The oil assembly (13) includes a top block (134) fixed to the bottom of the movable plate (11). Each top block (134) has a corresponding mounting groove (81) at its bottom that abuts against the corresponding notch above the movable rod (133). The movable rod (133) is slidably mounted in the transverse groove of the mounting block (8). A stopper rod (132) is connected to the right side of the movable rod (133). The stopper rod (132) is slidably connected to an oil rod (131) by a spring seal. The oil rod (131) is mounted on the right side of the bottom groove of the mounting block (8).

4. The modular wind turbine nacelle main frame load-bearing structure according to claim 3, characterized in that: The bottom of the top block (134) is designed as a sloping structure, and the sloping structure at the notch above the moving rod (133) corresponds to the sloping structure at the bottom of the top block (134).

5. The modular wind turbine nacelle main frame load-bearing structure according to claim 1, characterized in that: The oil assembly (13) also includes a fixed bracket (135) installed on the right end of the right slider (5). An oil rod (136) is fixed in the groove below the fixed bracket (135). A sliding column (137) is connected to the oil rod (136) by a spring. The sliding column (137) is sealed and limited to slide in the inner cavity of the oil rod (136). A screw (138) is spirally connected to the left side of the sliding column (137). The section of the screw (138) without the spiral groove is sealed and rotatably connected to the oil rod (136). The left end of the screw (138) is fixedly connected to the right end of the screw (6).

6. The modular wind turbine nacelle main frame load-bearing structure according to claim 5, characterized in that: The inner cavity of the second oil rod (136) is connected to multiple first oil rods (131) through a right-side port distributor and multiple hoses.

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