A semi-automatic bolt tensioning device for wind turbine variable pitch bearing

Abstract

The application relates to a kind of semi-automatic bolt stretching equipment for wind power variable pitch bearing, including central support seat, at least two radial lower telescopic arms arranged at the bottom of central support seat and placed uniformly in circumferential direction, lower drive module arranged at the center of the bottom of central support seat for simultaneously driving multiple lower telescopic arms to synchronously stretch and retract, connecting frame arranged at the outer end of lower telescopic arm respectively for connecting inner ring of variable pitch bearing, upper telescopic arm arranged radially above central support seat, upper drive module arranged at the top of central support seat for driving upper telescopic arm, stretching module arranged at the outer end of upper telescopic arm; the stretching module includes vertically placed Z-axis linear module, quick-change mechanism arranged at the driving end of Z-axis linear module, floating mechanism arranged on quick-change mechanism, intelligent stretcher vertically arranged on floating mechanism; the application has self-adaptive adjustment function, can reduce manual intervention, has high degree of automation, can improve wind power hub assembly quality and operation efficiency.

Description

Technical Field

[0001] This invention relates to the field of wind turbine manufacturing technology, and specifically to a semi-automatic bolt stretching device for wind turbine pitch bearings. Background Technology

[0002] As the core load-bearing component of a wind turbine generator, the wind turbine hub plays a crucial role in connecting the blades, main shaft, and nacelle. Its structural reliability directly affects the safe operation of the unit under complex conditions such as strong winds and vibrations. During the assembly of the hub and pitch bearing, the bolt tensioning process is a critical step in ensuring uniform preload at the connection interface. Its precision directly impacts the stress distribution and fatigue resistance of the bearing mating surfaces. Traditional manual tensioning methods suffer from uneven preload and low efficiency, while existing solutions using auxiliary tooling still have significant limitations.

[0003] Taking the existing technology CN202411544552.9 as an example, the pitch bearing connecting bolt tensioning fixture disclosed therein, through a combination structure of a support frame, a rotating beam, and a tensioner bracket, can support the tensioner and reduce the labor intensity of manual lifting to a certain extent. However, this solution has revealed the following technical defects in practical applications: 1. Insufficient Adjustment Accuracy and Synchronization: Although the bearing connecting plates at both ends of the support frame achieve radial adjustment through the first oblong hole, manual operation makes it difficult to ensure the synchronicity of the adjustment on both sides. When the adjustment deviation on both sides exceeds the tolerance range, the central axis of the support frame will be offset from the center of the pitch bearing, causing the tensioner and bolt axes to misalign. This deviation will not only cause the tensioner to jam and the tie rod and bolt threads to have difficulty engaging, but will also cause plastic deformation of the bolt due to non-axial tensile force, and in severe cases, even damage to the threads, directly affecting the long-term reliability of the connection structure.

[0004] 2. High reliance on manual labor: Existing tooling requires manual operation for multiple tasks, including circumferential positioning of the rotating beam, alignment and connection of the tensioner and bolts, and tightening of nuts. Specifically, operators must repeatedly rotate the heavy rotating beam to match the bolt distribution angle and manually adjust the tensioner's posture in a confined space to achieve precise alignment between the tie rod and bolts. After tensioning, each nut must be tightened individually, making the entire process take several hours. This high-intensity, repetitive labor not only significantly reduces assembly efficiency but also easily leads to increased preload dispersion due to human error, making it difficult to meet the stringent requirements of uniform preload for bolt groups in large wind turbine units.

[0005] In summary, the existing pitch bearing bolt tensioning fixtures still have significant shortcomings in terms of adjustment accuracy, degree of automation, and assembly efficiency. There is an urgent need to develop a high-precision tensioning device with adaptive adjustment function that can reduce manual intervention in order to improve the assembly quality and work efficiency of wind turbine hubs. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a semi-automatic bolt tensioning device for wind turbine pitch bearings.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a semi-automatic bolt tensioning device for wind turbine pitch bearings, comprising a central support base, at least two lower telescopic arms radially arranged at the bottom of the central support base and evenly placed along the circumference, a lower drive module arranged at the center of the bottom of the central support base for simultaneously driving the multiple lower telescopic arms to extend and retract synchronously, connecting frames respectively arranged at the outer ends of the lower telescopic arms for connecting the inner ring of the pitch bearing, an upper telescopic arm radially arranged above the central support base, an upper drive module arranged at the top of the central support base for driving the upper telescopic arm, and a tensioning module arranged at the outer ends of the upper telescopic arm; The stretching module includes a vertically placed Z-axis linear module, a quick-change mechanism set at the drive end of the Z-axis linear module, a floating mechanism set on the quick-change mechanism, an intelligent stretcher set vertically on the floating mechanism, and a visual positioning module for identifying the position of bolts on the pitch bearing.

[0008] Preferably, it also includes an X-axis linear module and a pre-stretching module disposed at the outer end of the upper telescopic arm; The X-axis linear module is horizontally positioned and vertically connected to the outer end of the upper telescopic arm; the X-axis linear module is a double-slide linear module, wherein the two slides are symmetrically arranged on the linear module and move closer or further away simultaneously under the drive of the linear module. The stretching module and the pre-stretching module are respectively mounted on two slides; The pre-stretching module also includes a vertically placed Z-axis linear module, a quick-change mechanism set at the drive end of the Z-axis linear module, and a floating mechanism set on the quick-change mechanism. The difference from the stretching module is that a nut tightener is vertically set on the floating mechanism.

[0009] Preferably, the floating mechanism includes a vertically placed floating seat, cantilever floating assemblies respectively disposed on both sides of the top of the floating seat, and a rotating support assembly disposed on the floating seat and located below the cantilever floating assemblies; The cantilever floating assembly includes a guide rod placed perpendicular to the floating seat, a slider slidably disposed on the guide rod, and floating springs sleeved on the guide rod and located on both sides of the slider; the inner end of the guide rod is movably connected to the floating seat through a rod end fisheye bearing, and the outer end is provided with a threaded limit end cap; the upper two sides of the intelligent tensioner or nut tightener are respectively connected to the slider. The rotating support assembly is a hinge structure, with one end rotatably connected to the floating seat and the other end connected to the lower part of the intelligent tensioner or nut tightener via fasteners.

[0010] Preferably, the cantilever floating assembly further includes a connecting seat and a limiting block; the connecting seat is used to connect the rod end fisheye bearing and the floating seat; the limiting block is installed on the connecting seat and forms a limiting hole between the limiting block and the connecting seat; the diameter of the limiting hole is slightly larger than the rod diameter of the rod end fisheye bearing, so that the guide rod can only rotate and swing within the range of motion of the rod end fisheye bearing.

[0011] Preferably, the Z-axis linear module includes a main slide and a driven slide, wherein the main slide is driven by the linear module, and the driven slide is connected to the main slide through an elastic element; The quick-change mechanism is used to connect the driven slide and the floating seat.

[0012] Preferably, at least two upper telescopic arms are provided, and they are evenly distributed along the circumferential direction of the pitch bearing; The upper drive module is located at the top center of the central support base and is used to simultaneously drive multiple upper telescopic arms to extend and retract synchronously. The upper drive module and the lower drive module have the same structure, but are placed symmetrically. Each includes a drive bracket, a rotating shaft that passes vertically through the center of the drive bracket, a driver installed on the drive bracket for driving the rotating shaft, an active bevel gear sleeved on the rotating shaft, multiple screws that extend into the telescopic arm and are threaded to the inner end of the telescopic arm, and multiple driven bevel gears installed at the ends of the screws and meshing with the active bevel gear.

[0013] Preferably, the plurality of the upper telescopic arms and lower telescopic arms are slidably disposed on the top and bottom of the central support via a slide rail assembly.

[0014] Preferably, the central support base has a flat structure and a square horizontal cross-section, with extensions extending diagonally at its four corners; The upper telescopic arm and the lower telescopic arm are each provided with four arms, and they are all placed along the diagonal direction of the central support base.

[0015] Preferably, the connecting frame includes a connecting plate vertically disposed at the outer end of the lower telescopic arm, a fan-shaped connecting plate disposed on the top of the connecting plate and mounted on the side of the inner ring of the pitch bearing, and a fan-shaped positioning plate disposed at the bottom of the fan-shaped connecting plate for abutting against the inner wall of the inner ring of the pitch bearing; the fan-shaped connecting plate is provided with at least two elongated holes corresponding to the threaded holes of the inner ring of the pitch bearing, and the fan-shaped connecting plate can be fixed on the side of the inner ring of the pitch bearing by fasteners passing through the elongated holes and the threaded holes.

[0016] Preferably, the top of the central support base is provided with a hoisting part, and the bottom is provided with at least three support legs that are evenly distributed in the circumferential direction and placed vertically; the height of the support legs is higher than that of the lower drive module.

[0017] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. This invention adopts a linkage design between the drive module and the telescopic arm. The drive module drives multiple telescopic arms to achieve high-precision synchronous extension and retraction. This not only breaks through the traditional manual adjustment method, but also enables rapid radial adaptive adjustment, thus making it compatible with different specifications of pitch bearings and significantly improving the versatility of the tooling. At the same time, it ensures that the central support base and the central axis of the pitch bearing are coincident, avoiding problems such as uneven load on the tensioner and bolt deformation caused by asynchronous adjustment. 2. The present invention also includes a pre-tensioning module, which can ensure that the nut on the pitch bearing is tightened before tensioning and locking, avoid the failure of the tie rod and bolt alignment due to loose nuts, eliminate assembly hazards caused by human negligence, and improve the pre-tightening qualification rate. 3. The present invention is equipped with a floating mechanism, which enables the intelligent tensioner to float axially and swing slightly. It can automatically correct its posture at the moment when the intelligent tensioner contacts the bolt axially, and achieve self-alignment. Compared with the rigid connection method, this design can greatly improve the thread engagement power of the tie rod and the bolt, and effectively avoid thread engagement damage. 4. The present invention is equipped with a quick-change mechanism, which facilitates the rapid replacement of the tension module according to different pitch bearing bolts, and achieves "one machine with multiple specifications" compatibility; 5. The present invention is equipped with a vision detection module, which can automatically identify the position of the bolts on the pitch bearing, making it easy to drive the intelligent tensioner to align with the bolts to be tensioned, and achieving a high degree of automation. Attached Figure Description

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings: Appendix Figure 1 This is a side view of the semi-automatic bolt tensioning device for wind turbine pitch bearings according to the present invention. Appendix Figure 2 This is a perspective view of the semi-automatic bolt tensioning device for wind turbine pitch bearings according to the present invention. Appendix Figure 3 This is a structural diagram of the X-axis linear module, stretching module, and pre-stretching module in this invention; Appendix Figure 4 This is a schematic diagram of the stretching module in this invention; Appendix Figure 5 This is a schematic diagram of the floating mechanism in this invention; Appendix Figure 6 This is a schematic diagram of the quick-change mechanism in this invention; Appendix Figure 7 This is a schematic diagram of the quick-change mechanism from another perspective in this invention; Appendix Figure 8 This is a vertical cross-sectional view of the driving module in this invention; Appendix Figure 9 for Figure 8 Enlarged view of a portion of point A in the middle; Appendix Figure 10 This is a horizontal cross-sectional view of the driving module in this invention; Appendix Figure 11 This is a schematic diagram of the structure of the central support base in this invention; Appendix Figure 12 This is a schematic diagram of the connecting frame in the present invention; Appendix Figure 13 This is a top view of the present invention after the connecting bracket has been installed; Appendix Figure 14 This is a schematic diagram illustrating the operation of the present invention.

[0019] The components include: 1. Central support base; 2. Lower telescopic arm; 3. Lower drive module; 4. Connecting frame; 41. Connecting plate; 42. Fan-shaped connecting plate; 421. Long slot; 43. Fan-shaped positioning plate; 5. Upper telescopic arm; 6. Upper drive module; 61. Drive bracket; 62. Rotary shaft; 63. Reducer; 64. Driving bevel gear; 65. Screw; 66. Driven bevel gear; 67. Handwheel; 68. Slide rail assembly; 7. X-axis linear module; 71. Slide table; 8. Tension module; 81. Z-axis linear module; 811. Main slide table; 812. Driven slide table; 813. Elastic element; 8131. Elastic frame; 8132. Guide post; 8133. Buffer spring; 8 2. Quick-change mechanism; 821. Main quick-change seat; 822. Slave quick-change seat; 823. Set screw; 824. Limiting plate; 83. Floating mechanism; 831. Floating seat; 832. Cantilever floating assembly; 8321. Guide rod; 8322. Slider; 8323. Floating spring; 8324. Rod end fisheye bearing; 8325. Limiting end cap; 8326. Connecting seat; 8327. Limiting block; 833. Rotary support assembly; 8331. Clamp; 84. Intelligent tensioner; 85. Vision positioning module; 9. Pre-tensioning module; 91. Nut tightener; 10. Controller; 11. Extension section; 12. Lifting section; 13. Support leg; 14. Hydraulic pump station. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Appendix Figure 1-3 The semi-automatic bolt stretching device for wind turbine pitch bearings according to the present invention includes a central support base 1, at least two lower telescopic arms 2 radially arranged at the bottom of the central support base 1 and evenly placed along the circumference, a lower drive module 3 arranged at the bottom center of the central support base 1 for simultaneously driving the multiple lower telescopic arms 2 to extend and retract synchronously, connecting frames 4 respectively arranged at the outer ends of the lower telescopic arms 2 for connecting the inner ring of the pitch bearing, an upper telescopic arm 5 radially arranged above the central support base 1, and an upper drive module 6 arranged at the top of the central support base 1 for driving the upper telescopic arm 5; the outer ends of the upper telescopic arms 5 are respectively provided with an X-axis linear module 7, a stretching module 8, and a pre-stretching module 9. The X-axis linear module 7 is horizontally arranged and vertically connected to the outer end of the upper telescopic arm 5; the X-axis linear module 7 is a double slide linear module, wherein two slides 71 are symmetrically arranged on the linear module and move closer or further away simultaneously under the drive of the linear module. The stretching module 8 and the pre-stretching module 9 are respectively mounted on two slides 71, each including a vertically placed Z-axis linear module 81, a quick-change mechanism 82 mounted on the drive end of the Z-axis linear module 81, and a floating mechanism 83 mounted on the quick-change mechanism 82. The stretching module 8 also includes an intelligent stretcher 84 vertically mounted on the floating mechanism 83 and a visual positioning module 85 for identifying the position of bolts on the pitch bearing. The pre-stretching module 9 also includes a nut tightener 91 vertically mounted on the floating mechanism 83; During installation: Based on the diameter of the pitch bearing inner ring, firstly, drive multiple lower telescopic arms 2 to extend and retract synchronously via the lower drive module 3 until the connecting brackets 4 at the ends of the multiple lower telescopic arms 2 connect with the pitch bearing inner ring, providing support for the entire semi-automatic bolt stretching equipment; then, drive the upper telescopic arm 5 to extend and retract via the upper drive module 6, so that the X-axis linear module 7, stretching module 8, and pre-stretching module 9 move to the stretching position. Then, adjust the distance between the stretching module 8 and the pre-stretching module 9 via the X-axis linear module 7 so that they are simultaneously positioned directly above two bolts on the pitch bearing; the stretching module 8 and the pre-stretching module 9 can be without bolts or with one or more bolts between them, depending on the bolt spacing of the pitch bearing, ensuring that there is no interference between the stretching module 8 and the pre-stretching module 9; During operation: First, the visual positioning module 85 locates the position of a bolt on the pitch bearing to be stretched. Then, the Z-axis linear module 81 of the pre-stretching module 9 and the stretching module 8 simultaneously drives the nut tightener 91 and the intelligent tensioner 84 to descend. The nut tightener 91 is used to pre-tighten the nut on the pitch bearing to prevent the nut from being loose during subsequent stretching, which could cause the tie rod in the intelligent tensioner 84 to fail to align with the bolt. The intelligent tensioner 84 is used to automatically stretch and lock the nut after the pre-stretching module 9 has tightened it. This device is electrically connected to the pitch bearing and drives the inner ring of the pitch bearing to rotate, thereby driving the device to rotate relative to the outer ring of the pitch bearing, stretching and locking the bolts on the pitch bearing in sequence.

[0022] Furthermore, the intelligent tensioner 84 is existing technology, such as the wind turbine generator hub assembly production line and assembly method disclosed in existing technology CN115890233A, which adds two motors to the traditional tensioner. One motor is used to drive the pull rod to rotate, realizing the connection and disconnection of the pull rod and the bolt; the other motor is used to drive the gear box to automatically lock the nut, eliminating manual operation and improving work efficiency.

[0023] Furthermore, the visual positioning module 85 includes a detection frame and a camera mounted on the detection frame; during operation: the camera collects the position of the bolts on the pitch bearing, thereby driving the intelligent tensioner 84 to align with the bolts and improve the alignment accuracy.

[0024] Furthermore, the camera position can be adjusted horizontally and vertically on the inspection frame, which not only reduces the need for machining precision but also facilitates on-site installation and debugging.

[0025] Furthermore, such as Figure 4 As shown, the floating mechanism 83 includes a vertically placed floating seat 831, cantilever floating components 832 respectively disposed on both sides of the top of the floating seat 831, and a rotary support component 833 disposed on the floating seat 831 and located on the symmetrical line of the two cantilever floating components 832; during operation: through the synergistic effect of the cantilever floating components 832 and the rotary support component 833, multi-degree-of-freedom pose compensation of the intelligent tensioner 84 or the nut tightener 91 is achieved.

[0026] Furthermore, such as Figure 5 As shown, the cantilever floating assembly 832 includes a guide rod 8321 placed perpendicular to the floating seat 831, a slider 8322 slidably disposed on the guide rod 8321, and floating springs 8323 sleeved on the guide rod 8321 and located on both sides of the slider 8322. The inner end of the guide rod 8321 is movably connected to the floating seat 831 through a rod end fisheye bearing 8324, and the outer end is provided with a threaded limit end cap 8325. The upper two sides of the intelligent tensioner 84 or nut tightener 91 are respectively connected to the slider 8322. During operation: the guide rod 8321 is movably connected to the floating seat 831 through the rod end fisheye bearing 8324, allowing the guide rod 8321 to swing within a certain angle range. In addition, the slider 8322 is slidably disposed on the guide rod 8321, and floating springs 8323 are provided at both ends of the slider 8322, so that the intelligent tensioner 84 or nut tightener 91 can move with multiple degrees of freedom. Furthermore, such as Figure 7As shown, the rotating support assembly 833 is a hinge structure, with one end rotatably connected to the floating seat 831, and the other end connected to the lower part of the intelligent tensioner 84 or nut tightener 91 via a clamp 8331; the rotation axis of one end of the rotating support assembly 833 and the floating seat 831 is in the radial direction of the pitch bearing, while the rotation axis of the rotating support assembly 833 itself is in the X-axis direction; during operation: the rotating support assembly 833 not only provides support, but also, through the rotation of the hinge structure combined with the swing of the guide rod 8321 of the cantilever floating assembly 832, allows the intelligent tensioner 84 or nut tightener 91 to adaptively adjust in the front-back, left-right, and tilt directions, achieving multi-dimensional posture correction.

[0027] Furthermore, such as Figure 5 As shown, the cantilever floating assembly 832 also includes a connecting seat 8326 and a limiting block 8327; the connecting seat 8326 is used to connect the rod end fisheye bearing 8324 and the floating seat 831, making its structure more stable; the limiting block 8327 is installed on the connecting seat 8326, and a limiting hole is formed between the limiting block 8327 and the connecting seat 8326; the diameter of the limiting hole is slightly larger than the rod diameter of the rod end fisheye bearing 8324, so that the guide rod 8321 can only rotate and swing within the range of motion of the rod end fisheye bearing 8324, which plays a limiting role and is used to protect the rod end fisheye bearing 8324.

[0028] Furthermore, such as Figure 4 As shown, the Z-axis linear module 81 includes a main slide 811 and a driven slide 812. The main slide 811 is driven by the linear module, while the driven slide 812 is not driven by the linear module and is only connected to the main slide 811 through an elastic element 813, and slides with the main slide 811. During operation: when the Z-axis linear module 81 drives the intelligent tensioner 84 or the nut tightener 91 to descend and contact the bolt on the pitch bearing, the elastic element 813 not only plays a buffering role to avoid rigid contact and improve the overall service life, but also enables the intelligent tensioner 84 or the nut tightener 91 to have a floating effect.

[0029] Furthermore, such as Figure 6 As shown, the quick-change mechanism 82 is used to connect the driven slide 812 and the floating seat 831, including a main quick-change seat 821 vertically arranged on the driven slide 812 and a secondary quick-change seat 822 arranged on the back of the floating seat 831; the main quick-change seat 821 and the secondary quick-change seat 822 are quickly connected by a dovetail groove structure; in this embodiment, the main quick-change seat 821 is provided with a vertically placed dovetail protrusion, while the secondary quick-change seat 822 is provided with a dovetail groove corresponding to the dovetail protrusion; when it is necessary to replace the intelligent tensioner 84 or the nut tightener 91 for pitch bearings of different diameters, the dovetail groove on the quick-change seat is fitted onto the dovetail protrusion on the main quick-change seat 821 to achieve quick installation.

[0030] Furthermore, such as Figure 7 As shown, the bottom of the main quick-change seat 821 is provided with a limiting plate 824 to prevent the secondary quick-change seat 822 from falling off the main quick-change seat 821; the side of the secondary quick-change seat 822 is provided with a set screw 823 for abutting against the main quick-change seat 821; this application uses the dual function of the limiting plate 824 and the set screw 823 to fix the secondary quick-change seat 822.

[0031] Furthermore, such as Figure 6 As shown, the elastic element 813 includes an elastic frame 8131 mounted on the main slide table 811, a guide post 8132 that passes vertically through the elastic frame 8131 and is bolted to the main quick-change seat 821, and a buffer spring 8133 that is sleeved on the guide post 8132 and located between the elastic frame 8131 and the main quick-change seat 821. During operation: Since the guide post 8132 passes vertically through the elastic frame 8131 and is bolted to the main quick-change seat 821, it serves to connect the elastic frame 8131 and the main quick-change seat 821. The buffer spring 8133 is mounted on the guide post 8132 between the elastic frame 8131 and the main quick-change seat 821. When the Z-axis linear module 81 drives the intelligent tensioner 84 or the nut tightener 91 to descend and contact the bolt on the pitch bearing, the guide post 8132 can slide upward along the elastic frame 8131. At this time, the buffer spring 8133 plays a buffering role.

[0032] Furthermore, at least two upper telescopic arms 5 are provided, and they are evenly distributed along the circumferential direction of the pitch bearing; The upper drive module 6 is located at the top center of the central support 1 and is used to simultaneously drive multiple upper telescopic arms 5 to extend and retract synchronously. like Figure 8 As shown, the upper drive module 6 and the lower drive module 3 have the same structure, but are placed symmetrically. In this embodiment, the upper drive module 6 will be used as an example for detailed description. Figure 9-10 As shown, the upper drive module 6 includes a drive bracket 61, a rotating shaft 62 that passes vertically through the center of the drive bracket 61, a reducer 63 mounted on the drive bracket 61 for driving the rotating shaft 62, a drive bevel gear 64 sleeved on the rotating shaft 62, multiple screws 65 that extend into the upper telescopic arm 5 and are threaded to the inner end of the upper telescopic arm 5, and multiple driven bevel gears 66 mounted at the ends of the screws 65 and meshing with the drive bevel gear 64. During operation: The reducer 63 drives the rotating shaft 62 to rotate the active bevel gear 64. Since multiple driven bevel gears 66 mesh with the active bevel gear 64, they synchronously drive multiple screws 65 to rotate. At the same time, the screws 65 are threadedly connected to the inner end of the upper telescopic arm 5, thereby driving multiple upper telescopic arms 5 to extend and retract synchronously.

[0033] Furthermore, such as Figure 9As shown, the reducer 63 can also be driven by the handwheel 67, that is, it can be driven electrically or manually by the handwheel 67, making it more convenient to use.

[0034] Furthermore, such as Figure 11 As shown, the central support 1 has a flat structure and a square horizontal cross-section, with extensions 11 extending diagonally at its four corners. The upper telescopic arm 5 and the lower telescopic arm 2 are each provided with four arms, and are all placed along the diagonal direction of the central support seat 1. By using a flat central support 1, the thickness of the machine can be greatly reduced. At the same time, extensions 11 extending diagonally are provided at the four corners, making the overall structure more robust and with a strong load-bearing capacity after the telescopic arm is installed. Furthermore, by placing the four upper telescopic arms 5 along the diagonal direction of the central support seat 1, this application can simultaneously stretch and tighten the four bolts in a cross direction, which not only improves work efficiency but also makes the stretching and tightening force more uniform.

[0035] Furthermore, such as Figure 12 As shown, the four upper telescopic arms 5 and lower telescopic arms 2 are all slidably mounted on the top and bottom of the central support base 1 via the slide rail assembly 68. By setting the slide rail assembly 68, this application not only makes the telescopic arm extension and retraction process more stable, but also reduces wear and increases service life.

[0036] Furthermore, such as Figure 12 As shown, the connecting frame 4 includes a connecting plate 41 vertically disposed at the outer end of the lower telescopic arm 2, a fan-shaped connecting plate 42 horizontally disposed on the top of the connecting plate 41 and mounted on the side of the inner ring of the pitch bearing, and a fan-shaped positioning plate 43 disposed at the bottom of the fan-shaped connecting plate 42 for abutting against the inner wall of the inner ring of the pitch bearing; the fan-shaped connecting plate 42 is provided with at least two elongated holes 421 corresponding to the threaded holes of the inner ring of the pitch bearing, and the fan-shaped connecting plate 42 can be fixed on the side of the inner ring of the pitch bearing by fasteners passing through the elongated holes 421 and the threaded holes of the inner ring of the pitch bearing; During operation: Based on the diameter of the pitch bearing inner ring, the lower drive module 3 simultaneously drives multiple lower telescopic arms 2 to extend and retract synchronously until the sector-shaped positioning plate 43 abuts against the inner wall of the pitch bearing inner ring. Then, by passing fasteners through the elongated hole 421 and the threaded hole of the pitch bearing inner ring, the sector-shaped connecting plate 42 is fixed on the side of the pitch bearing inner ring, thus completing the installation.

[0037] Furthermore, such as Figure 2 As shown, the top of the central support 1 is provided with a lifting part 12, which facilitates the lifting of the equipment by a crane or the like, and its installation on or removal from the inner ring of the pitch bearing.

[0038] Furthermore, such as Figure 1 As shown, the bottom of the central support base 1 is provided with at least three support legs 13 that are evenly distributed in the circumferential direction and placed vertically; the height of the support legs 13 is higher than that of the lower drive module 3; when the device is removed from the inner ring of the pitch bearing, the support legs 13 play a supporting role. Since the height of the support legs 13 is higher than that of the lower drive module 3, the device can be placed stably on the ground or platform.

[0039] Furthermore, such as Figure 13 As shown, it also includes a hydraulic pump station 14 that provides pressure to the smart tensioner, wherein the hydraulic pump station 14 is arranged alternately with the telescopic arm and is installed on the side of the central support 1.

[0040] Furthermore, such as Figure 2 As shown, it also includes a controller 10 for controlling the entire device; the controller 10 is located on top of the upper drive module 6.

[0041] The above are merely specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. All technical solutions formed by equivalent transformations or substitutions fall within the scope of protection of the present invention.

Claims

1. A semi-automatic bolt tensioning device for wind turbine pitch bearings, characterized in that: It includes a central support base, at least two lower telescopic arms radially arranged at the bottom of the central support base and evenly placed along the circumference, a lower drive module located at the center of the bottom of the central support base for simultaneously driving the multiple lower telescopic arms to extend and retract synchronously, connecting frames located at the outer ends of the lower telescopic arms for connecting to the inner ring of the pitch bearing, an upper telescopic arm radially arranged above the central support base, an upper drive module located at the top of the central support base for driving the upper telescopic arm, and a tensioning module located at the outer end of the upper telescopic arm. The stretching module includes a vertically placed Z-axis linear module, a quick-change mechanism set at the drive end of the Z-axis linear module, a floating mechanism set on the quick-change mechanism, an intelligent stretcher set vertically on the floating mechanism, and a visual positioning module for identifying the position of bolts on the pitch bearing. It also includes an X-axis linear module and a pre-stretching module located at the outer end of the upper telescopic arm; The X-axis linear module is horizontally positioned and vertically connected to the outer end of the upper telescopic arm; the X-axis linear module is a double-slide linear module, wherein the two slides are symmetrically arranged on the linear module and move closer or further away simultaneously under the drive of the linear module. The stretching module and the pre-stretching module are respectively mounted on two slides; The pre-stretching module also includes a vertically placed Z-axis linear module, a quick-change mechanism set at the drive end of the Z-axis linear module, and a floating mechanism set on the quick-change mechanism. The difference from the stretching module is that a nut tightener is vertically set on the floating mechanism. The floating mechanism includes a vertically placed floating seat, cantilever floating assemblies respectively disposed on both sides of the top of the floating seat, and a rotating support assembly disposed on the floating seat and located below the cantilever floating assemblies. The cantilever floating assembly includes a guide rod placed perpendicular to the floating seat, a slider slidably disposed on the guide rod, and floating springs sleeved on the guide rod and located on both sides of the slider; the inner end of the guide rod is movably connected to the floating seat through a rod end fisheye bearing, and the outer end is provided with a threaded limit end cap; the upper two sides of the intelligent tensioner or nut tightener are respectively connected to the slider. The rotating support assembly is a hinge structure, with one end rotatably connected to the floating seat and the other end connected to the lower part of the intelligent tensioner or nut tightener via fasteners.

2. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1, characterized in that: The cantilever floating assembly also includes a connecting seat and a limiting block; the connecting seat is used to connect the rod end fisheye bearing and the floating seat; the limiting block is installed on the connecting seat and forms a limiting hole between the limiting block and the connecting seat; the diameter of the limiting hole is slightly larger than the rod diameter of the rod end fisheye bearing, so that the guide rod can only rotate and swing within the range of motion of the rod end fisheye bearing.

3. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 2, characterized in that: The Z-axis linear module includes a main slide and a driven slide, wherein the main slide is driven by the linear module, and the driven slide is connected to the main slide through an elastic element. The quick-change mechanism is used to connect the driven slide and the floating seat.

4. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1, characterized in that: At least two upper telescopic arms are provided, and they are evenly distributed along the circumference of the pitch bearing; The upper drive module is located at the top center of the central support base and is used to simultaneously drive multiple upper telescopic arms to extend and retract synchronously. The upper drive module and the lower drive module have the same structure, but are placed symmetrically. Each includes a drive bracket, a rotating shaft that passes vertically through the center of the drive bracket, a driver installed on the drive bracket for driving the rotating shaft, an active bevel gear sleeved on the rotating shaft, multiple screws that extend into the telescopic arm and are threaded to the inner end of the telescopic arm, and multiple driven bevel gears installed at the ends of the screws and meshing with the active bevel gear.

5. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1, characterized in that: The multiple upper and lower telescopic arms are slidably mounted on the top and bottom of the central support via a slide rail assembly.

6. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1, characterized in that: The central support base has a flat structure and a square horizontal cross-section, with extensions extending diagonally at its four corners. The upper telescopic arm and the lower telescopic arm are each provided with four arms, and they are all placed along the diagonal direction of the central support base.

7. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1, characterized in that: The connecting frame includes a connecting plate vertically disposed at the outer end of the lower telescopic arm, a fan-shaped connecting plate disposed on the top of the connecting plate and mounted on the side of the inner ring of the pitch bearing, and a fan-shaped positioning plate disposed at the bottom of the fan-shaped connecting plate to abut against the inner wall of the inner ring of the pitch bearing; the fan-shaped connecting plate is provided with at least two elongated holes corresponding to the threaded holes of the inner ring of the pitch bearing, and the fan-shaped connecting plate can be fixed on the side of the inner ring of the pitch bearing by fasteners passing through the elongated holes and the threaded holes.

8. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1, characterized in that: The top of the central support base is provided with a hoisting part, and the bottom is provided with at least three support legs that are evenly distributed in the circumferential direction and placed vertically; the height of the support legs is higher than that of the lower drive module.

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