Semi-automatic bolt stretching equipment for wind power variable pitch bearing

Abstract

The invention relates to semi-automatic bolt stretching equipment for a wind power variable pitch bearing. The at least two lower telescopic arms are radially arranged at the bottom of the central supporting seat and are uniformly arranged along the circumferential direction; the lower driving module is arranged at the center of the bottom of the central supporting seat and is used for simultaneously driving the plurality of lower telescopic arms to synchronously stretch out and draw back; the connecting frames are respectively arranged at the outer ends of the lower telescopic arms and are used for connecting an inner ring of a variable pitch bearing; the upper telescopic arm is radially arranged above the supporting template, the upper driving module is arranged at the top of the central supporting seat and is used for driving the upper telescopic arm, and the stretching module is arranged at the outer end of the upper telescopic arm; the stretching module comprises a vertically-arranged Z-axis linear module, a quick-changing mechanism arranged at the driving end of the Z-axis linear module, a floating mechanism arranged on the quick-changing module and an intelligent stretcher vertically arranged on the floating mechanism. The device has the self-adaptive adjusting function, manual intervention can be reduced, the automation degree is high, and the assembly quality and the operation efficiency of the wind power hub can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine manufacturing, in particular to a semi-automatic bolt tensioning device for a wind turbine pitch bearing. Background Art

[0002] As the core load-bearing component of a wind turbine generator set, the wind turbine hub plays a key role in connecting the blades, main shaft, and nacelle. Its structural reliability is directly related to the unit's operational safety under complex working conditions such as strong winds and vibrations. During the assembly process of the hub and pitch bearing, the bolt tensioning process is a key step in ensuring uniform preload at the connection interface. Its accuracy directly affects the stress distribution and fatigue resistance of the bearing mating surface. Traditional manual tensioning methods have problems such as uneven preload and low operating efficiency, and the existing solutions using auxiliary tooling still have significant limitations.

[0003] Taking the prior art CN202411544552.9 as an example, the pitch bearing connecting bolt tensioning fixture disclosed therein can support the tensioner through the combined structure of the support frame, rotating beam and tensioner bracket, thereby reducing the labor intensity of manual lifting to a certain extent. However, this solution has exposed the following technical defects in actual application:

[0004] 1. Insufficient adjustment accuracy and synchronization: Although the bearing connecting plates installed at both ends of the support frame can achieve radial adjustment through the first waist-shaped hole, it is difficult to ensure the synchronization of the adjustment amount on both sides through manual operation. 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, resulting in the tensioner and the bolt axis being unable to be aligned. This deviation will not only cause the tensioner to get stuck and the pull rod to engage with the bolt thread, but also cause plastic deformation of the bolt due to non-axial tension. In severe cases, it may even cause thread damage, directly affecting the long-term reliability of the connection structure.

[0005] 2. High reliance on manual labor: Existing tooling requires manual work to complete multiple operations, including circumferential positioning of the rotating beam, alignment of the tensioner and bolts, and nut tightening. Specifically, the operator needs to repeatedly rotate the bulky rotating beam to match the bolt distribution angle, and manually adjust the tensioner posture in a narrow space to achieve precise docking of the pull rod and the bolt. After the stretching is completed, the nuts need to be tightened one by one, and the entire process takes up to several hours. This high-intensity repetitive labor not only significantly reduces assembly efficiency, but also easily increases the dispersion of preload force due to human operational errors, making it difficult to meet the stringent requirements of large wind turbines for uniform preload of bolt groups.

[0006] To sum up, the existing technology of pitch bearing bolt stretching tooling still has obvious shortcomings in adjustment accuracy, operation automation and assembly efficiency. It is urgent to develop a high-precision stretching device with adaptive adjustment function that can reduce manual intervention to improve the assembly quality and operation efficiency of wind turbine hub. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a semi-automatic bolt tensioning device for wind turbine pitch bearings.

[0008] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a semi-automatic bolt tensioning device for a wind turbine pitch bearing, comprising a central support seat, at least two lower telescopic arms radially arranged at the bottom of the central support seat and evenly placed along the circumferential direction, a lower driving module arranged at the center of the bottom of the central support seat for simultaneously driving multiple lower telescopic arms to extend and retract synchronously, connecting frames respectively arranged 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 support template, an upper driving module arranged at the top of the central support seat for driving the upper telescopic arm, and a tensioning module arranged at the outer end of the upper telescopic arm;

[0009] The stretching module includes a vertically placed Z-axis linear module, a quick-change mechanism arranged at the driving end of the Z-axis linear module, a floating mechanism arranged on the quick-change module, an intelligent stretcher vertically arranged on the floating mechanism, and a visual positioning module for identifying the bolt position on the pitch bearing.

[0010] Preferably, it also includes an X-axis linear module and a pre-stretching module arranged at the outer end of the upper telescopic arm;

[0011] The X-axis linear module is horizontally arranged and vertically connected to the outer end of the upper telescopic arm; the X-axis linear module is a double-slide linear module, in which the two slides are symmetrically arranged on the linear module and move closer or farther away at the same time under the drive of the linear module;

[0012] The stretching module and the pre-stretching module are respectively arranged on two slides;

[0013] The pre-stretching module also includes a vertically placed Z-axis linear module, a quick-change mechanism arranged at the driving end of the Z-axis linear module, and a floating mechanism arranged on the quick-change module. The difference from the stretching module is that a nut tightener is vertically arranged on the floating mechanism.

[0014] Preferably, the floating mechanism includes a vertically placed floating seat, cantilever floating assemblies respectively arranged on both sides of the top of the floating seat, and a rotating support assembly arranged on the floating seat and located below the cantilever floating assembly;

[0015] The cantilever floating assembly includes a guide rod placed perpendicular to the floating seat, a slider slidably arranged 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 sides of the intelligent stretcher or nut tightener are respectively connected to the slider;

[0016] The rotary support assembly is a hinge structure, one end of which is rotatably connected to the floating seat, and the other end is connected to the lower part of the intelligent stretcher or nut tightener through a fastener.

[0017] Preferably, the cantilever floating assembly also includes a connecting seat and a limit block; the connecting seat is used to connect the rod-end fisheye bearing and the floating seat; the limit block is installed on the connecting seat, and a limit hole is formed between the limit block and the connecting seat; the aperture of the limit 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 movable range of the rod-end fisheye bearing.

[0018] 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 member;

[0019] The quick-change mechanism is used to connect the driven slide and the floating seat.

[0020] Preferably, at least two upper telescopic arms are provided and are evenly distributed along the circumference of the pitch bearing;

[0021] The upper drive module is arranged at the top center of the central support base, and is used to drive multiple upper telescopic arms to extend and retract synchronously at the same time;

[0022] The upper drive module and the lower drive module have the same structure, but are placed symmetrically up and down, and both include a drive bracket, a rotating shaft vertically passing through the center of the drive bracket, a driver arranged on the drive bracket for driving the rotating shaft, a driving bevel gear sleeved on the rotating shaft, a plurality of screws extending into the telescopic arm and threadedly connected to the inner end of the telescopic arm, and a plurality of driven bevel gears arranged at the ends of the screws and all meshing with the driving bevel gear.

[0023] Preferably, the plurality of upper telescopic arms and lower telescopic arms are slidably arranged on the top and top of the central support seat through a slide rail assembly.

[0024] Preferably, the central support seat is a flat structure with a square horizontal cross section, and its four corners are provided with extensions extending in the diagonal direction;

[0025] There are four upper telescopic arms and four lower telescopic arms, and they are all placed along the diagonal direction of the central support seat.

[0026] Preferably, the connecting frame includes a connecting plate vertically arranged on the outer end of the lower telescopic arm, a fan-shaped connecting plate arranged on the top of the connecting plate and installed on the side of the inner ring of the pitch bearing, and a fan-shaped positioning plate arranged at the bottom of the fan-shaped connecting plate for supporting the inner wall of the inner ring of the pitch bearing; at least two elongated holes corresponding to the threaded holes of the inner ring of the pitch bearing are provided on the fan-shaped connecting plate, and the fan-shaped connecting plate can be fixed on the side of the inner ring of the pitch bearing by passing a fastener through the elongated hole and the threaded hole.

[0027] Preferably, a hoisting portion is provided on the top of the central support seat, and at least three vertically placed supporting legs are provided on the bottom, which are evenly distributed in the circumferential direction; and the height of the supporting legs is higher than that of the lower driving module.

[0028] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0029] 1. The present 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 can quickly complete radial adaptive adjustment, thereby being compatible with pitch bearings of different specifications, significantly improving the versatility of the tooling. At the same time, it ensures that the center support seat coincides with the center axis of the pitch bearing, avoiding problems such as tensioner overload and bolt deformation caused by asynchronous adjustment.

[0030] 2. The present invention also adds a pre-stretching module, which can ensure that the nut on the pitch bearing is in a tightened state before stretching and locking, avoiding the failure of the tie rod and bolt alignment due to loose nuts, eliminating assembly risks caused by manual negligence, and improving the pre-tightening qualification rate;

[0031] 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 position at the moment when the intelligent tensioner axially contacts the bolt, achieving self-alignment. Compared with the rigid connection method, this design can greatly improve the success rate of meshing between the pull rod and the bolt thread, effectively avoiding thread bite damage.

[0032] 4. The present invention is equipped with a quick-change mechanism, which facilitates the rapid replacement of the tensioning module according to different pitch bearing bolts, thus achieving "one machine with multiple specifications" compatibility;

[0033] 5. The present invention is provided with a visual detection module, which can automatically identify the position of the bolts on the pitch bearing, facilitate driving the intelligent tensioner to align with the bolts to be stretched, and has a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0035] Attachment Figure 1 A side view of the semi-automatic bolt tensioning device for wind turbine pitch bearings according to the present invention;

[0036] Attachment Figure 2 A perspective view of the semi-automatic bolt tensioning device for wind turbine pitch bearings according to the present invention;

[0037] Attachment Figure 3 This is a structural diagram of the X-axis linear module, stretching module, and pre-stretching module in the present invention;

[0038] Attachment Figure 4Schematic diagram of the structure of the stretching module in the present invention;

[0039] Attachment Figure 5 It is a structural schematic diagram of the floating mechanism in the present invention;

[0040] Attachment Figure 6 Schematic diagram of the structure of the quick-change mechanism of the present invention;

[0041] Attachment Figure 7 This is a schematic structural diagram of the quick-change mechanism of the present invention from another perspective;

[0042] Attachment Figure 8 A vertical cross-sectional view of the driving module of the present invention;

[0043] Attachment Figure 9 for Figure 8 A partial enlarged view of the middle A;

[0044] Attachment Figure 10 A horizontal cross-sectional view of the driving module of the present invention;

[0045] Attachment Figure 11 This is a schematic structural diagram of the central support seat in the present invention;

[0046] Attachment Figure 12 Schematic diagram of the structure of the connecting frame in the present invention;

[0047] Attachment Figure 13 This is a top view of the present invention after the connecting frame is installed;

[0048] Attachment Figure 14 It is a working schematic diagram of the present invention.

[0049] Among them: 1. Center support seat; 2. Lower telescopic arm; 3. Lower drive module; 4. Connecting frame; 41. Connecting plate; 42. Fan-shaped connecting plate; 421. Long strip hole; 43. Fan-shaped positioning plate; 5. Upper telescopic arm; 6. Upper drive module; 61. Drive bracket; 62. Rotating shaft; 63. Reducer; 64. Active bevel gear; 65. Screw; 66. Driven bevel gear; 67. Handwheel; 68. Slide rail assembly; 7. X-axis linear module; 71. Slide; 8. Stretching module; 81. Z-axis linear module; 811. Main slide; 812. Driven slide; 813. Elastic member; 8131. Elastic frame; 8132. Guide column; 8133. Buffer spring; 8 2. Quick-change mechanism; 821. Main quick-change seat; 822. Slave quick-change seat; 823. Top screw; 824. Limit 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. Limit end cover; 8326. Connecting seat; 8327. Limit block; 833. Rotating support assembly; 8331. Clamp; 84. Intelligent stretcher; 85. Visual positioning module; 9. Pre-stretching module; 91. Nut tightener; 10. Controller; 11. Extension; 12. Lifting unit; 13. Support leg; 14. Hydraulic pump station. DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] Attachment Figure 1-3 The semi-automatic bolt tensioning device for wind turbine pitch bearings according to the present invention comprises 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 spaced along the circumferential direction, a lower drive module 3 arranged at the center of the bottom of the central support base 1 for simultaneously driving multiple lower telescopic arms 2 to extend and retract synchronously, a connecting frame 4 respectively arranged at the outer ends of the lower telescopic arms 2 for connecting to the inner ring of the pitch bearing, an upper telescopic arm 5 radially arranged above the support template, 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;

[0052] 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, in which two slides 71 are symmetrically arranged on the linear module and move closer or farther away at the same time under the drive of the linear module;

[0053] The stretching module 8 and the pre-stretching module 9 are respectively arranged on two slides 71, and each includes a vertically placed Z-axis linear module 81, a quick-change mechanism 82 arranged at the driving end of the Z-axis linear module 81, and a floating mechanism 83 arranged on the quick-change module;

[0054] The stretching module 8 also includes an intelligent stretcher 84 vertically arranged on the floating mechanism 83 and a visual positioning module 85 for identifying the position of the bolts on the pitch bearing;

[0055] The pre-stretching module 9 further includes a nut tightener 91 vertically arranged on the floating mechanism 83;

[0056] During installation: according to the diameter of the inner ring of the pitch bearing, first drive the multiple lower telescopic arms 2 to extend and retract synchronously through the lower drive module 3 until the connecting frame 4 at the end of the multiple lower telescopic arms 2 is connected to the inner ring of the pitch bearing, which plays a supporting role for the entire semi-automatic bolt tensioning equipment; then drive the upper telescopic arm 5 to extend and retract through the upper drive module 6, so that the X-axis linear module 7, the stretching module 8 and the pre-stretching module 9 move to the stretching position, and then adjust the spacing between the stretching module 8 and the pre-stretching module 9 through the X-axis linear module 7 so that they can be located directly above the two bolts on the pitch bearing at the same time; there may be no bolts between the stretching module 8 and the pre-stretching module 9, or one or more bolts may be separated, which is determined by the bolt spacing of the pitch bearing. Make sure that there is no interference between the stretching module 8 and the pre-stretching module 9;

[0057] During operation: first, the position of a bolt to be stretched on the pitch bearing is located by the visual positioning module 85, and 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 stretcher 84 to descend, wherein the nut tightener 91 is first used to pre-tighten the nut on the pitch bearing to avoid the nut on the pitch bearing being in a loose state during subsequent stretching, resulting in failure of the alignment between the pull rod and the bolt in the subsequent intelligent stretcher 84; and the intelligent stretcher 84 is used to automatically stretch the screws tightened by the pre-stretching module 9 and lock the nut; wherein this device is electrically connected to the pitch bearing, and the pitch bearing itself drives the inner ring to rotate, thereby driving this device to rotate relative to the outer ring of the pitch bearing, and sequentially stretching and locking the bolts on the pitch bearing.

[0058] Furthermore, the intelligent stretcher 84 is a prior art, such as the prior art CN115890233A discloses a wind turbine hub assembly production line and assembly method, that is, two motors are added to the traditional stretcher, one of which is used to drive the pull rod to rotate, thereby connecting and disconnecting the pull rod from the bolt; the other motor is used to drive the gear box to automatically lock the nut, eliminating manual operation and improving work efficiency.

[0059] Furthermore, the visual positioning module 85 includes a detection frame and a camera arranged on the detection frame; when working: the position of the bolts on the pitch bearing is collected by the camera, thereby driving the intelligent stretcher 84 to align with the bolts, thereby improving the positioning accuracy.

[0060] Furthermore, the detection frame can adjust the position of the camera in the horizontal and height directions, which not only reduces the processing accuracy but also facilitates on-site installation and debugging.

[0061] Further, if Figure 4 As shown, the floating mechanism 83 includes a vertically placed floating seat 831, cantilever floating components 832 respectively arranged on both sides of the top of the floating seat 831, and a rotating support component 833 arranged on the floating seat 831 and located on the symmetry line of the two cantilever floating components 832; when working: through the coordinated action of the cantilever floating component 832 and the rotating support component 833, the multi-degree-of-freedom posture compensation of the intelligent stretcher 84 or the nut tightener 91 is realized.

[0062] Further, if 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 set 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 cover 8325; the upper two sides of the intelligent stretcher 84 or nut tightener 91 are respectively connected to the slider 8322; when working: 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, and the slider 8322 is slidably set on the guide rod 8321, and the floating springs 8323 are provided at both ends of the slider 8322, so that the intelligent stretcher 84 or nut tightener 91 can move with multiple degrees of freedom;

[0063] Further, if Figure 7 As shown, the rotating support assembly 833 is a hinge structure, one end of which is rotatably connected to the floating seat 831, and the other end is connected to the lower part of the intelligent stretcher 84 or the nut tightener 91 through the clamp 8331; the rotation axis of one end of the rotating support assembly 833 and the floating seat 831 is the radial direction of the pitch bearing, and the rotation axis of the rotating support assembly 833 itself is the X-axis direction; when working: the rotating support assembly 833 not only plays a supporting role, but also through the rotation of the hinge structure combined with the swing of the guide rod 8321 of the cantilever floating assembly 832, the intelligent stretcher 84 or the nut tightener 91 can be adaptively adjusted in the front and back, left and right and tilt directions, thereby realizing multi-dimensional posture correction.

[0064] Further, if Figure 5As shown, the cantilever floating assembly 832 also includes a connecting seat 8326 and a limit 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 limit block 8327 is installed on the connecting seat 8326, and a limit hole is formed between the connecting seat 8326 and the connecting seat 8326; the aperture of the limit 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 movable range of the rod-end fisheye bearing 8324, playing a limiting role and being used to protect the rod-end fisheye bearing 8324.

[0065] Further, if Figure 4 As shown, the Z-axis linear module 81 includes a main slide 811 and a driven slide 812, wherein 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 member 813, and slides following the main slide 811; during operation: when the Z-axis linear module 81 drives the intelligent stretcher 84 or the nut tightener 91 to descend and contact the bolts on the pitch bearing, the elastic member 813 not only plays a buffering role to avoid rigid contact and improve the overall service life, but also enables the intelligent stretcher 84 or the nut tightener 91 to have an up and down floating effect.

[0066] Further, if 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 slave quick-change seat 822 arranged on the back of the floating seat 831; the main quick-change seat 821 and the slave quick-change seat 822 are quickly connected through a dovetail groove structure; in this embodiment, a vertically placed dovetail protrusion is provided on the main quick-change seat 821, and a dovetail groove corresponding to the dovetail protrusion is provided on the slave quick-change seat 822; when the intelligent tensioner 84 or the nut tightener 91 needs to be replaced for pitch bearings of different diameters, the dovetail groove on the quick-change seat is inserted into the dovetail protrusion on the main quick-change seat 821 to achieve quick installation.

[0067] Further, if Figure 7 As shown, a limiting plate 824 is provided at the bottom of the main quick-change seat 821 to prevent the slave quick-change seat 822 from falling off the main quick-change seat 821; a top screw 823 is provided on the side of the slave quick-change seat 822 to support the main quick-change seat 821; the present application fixes the slave quick-change seat 822 through the dual functions of the limiting plate 824 and the top screw 823.

[0068] Further, if Figure 6As shown, the elastic member 813 includes an elastic frame 8131 arranged on the main slide 811, a guide column 8132 vertically passing through the elastic frame 8131 and being bolted to the main quick-change seat 821, and a buffer spring 8133 sleeved on the guide column 8132 and located between the elastic frame 8131 and the main quick-change seat 821; when working: since the guide column 8132 vertically passes through the elastic frame 8131 and is bolted to the main quick-change seat 821, it plays the role of connecting the elastic frame 8131 and the main quick-change seat 821, and a buffer spring 8133 is provided on the guide column 8132 between the elastic frame 8131 and the main quick-change seat 821. When the Z-axis linear module 81 drives the intelligent stretcher 84 or the nut tightener 91 to descend and contact the bolt on the pitch bearing, the guide column 8132 can slide upward along the elastic frame 8131, and at this time the buffer spring 8133 plays a buffering role.

[0069] Furthermore, at least two upper telescopic arms 5 are provided and are evenly distributed along the circumferential direction of the pitch bearing;

[0070] The upper driving module 6 is arranged at the top center of the central support base 1, and is used to drive the multiple upper telescopic arms 5 to extend and retract synchronously;

[0071] like Figure 8 As shown, the upper driving module 6 and the lower driving module 3 have the same structure, but are placed symmetrically up and down. In this embodiment, the upper driving module 6 is taken as an example for detailed description. Figure 9-10 As shown, the upper driving module 6 includes a driving bracket 61, a rotating shaft 62 vertically passing through the center of the driving bracket 61, a reducer 63 provided on the driving bracket 61 for driving the rotating shaft 62, a driving bevel gear 64 sleeved on the rotating shaft 62, a plurality of screws 65 extending into the upper telescopic arm 5 and threadedly connected to the inner end of the upper telescopic arm 5, and a plurality of driven bevel gears 66 provided at the ends of the screws 65 and all meshing with the driving bevel gear 64;

[0072] During operation: the reducer 63 drives the rotating shaft 62 to drive the active bevel gear 64 to rotate. Since multiple driven bevel gears 66 are engaged with the active bevel gear 64, multiple screws 65 are synchronously driven to rotate. At the same time, the screws 65 are threadedly connected to the inner ends of the upper telescopic arms 5, thereby driving the multiple upper telescopic arms 5 to extend and retract synchronously.

[0073] Further, if Figure 9 As shown, the reducer 63 can also be driven by a hand wheel 67, that is, it can be driven electrically or manually by the hand wheel 67, which is more convenient to use.

[0074] Further, if Figure 11 As shown, the central support seat 1 is a flat structure with a square horizontal cross section, and its four corners are provided with extensions 11 extending in the diagonal direction;

[0075] The upper telescopic arms 5 and the lower telescopic arms 2 are each provided with four, and are all placed along the diagonal direction of the central support base 1;

[0076] The present application can greatly reduce the thickness of the entire machine by using a flat central support base 1. At the same time, the four corners are respectively provided with extensions 11 extending in the diagonal direction. After the telescopic arm is installed, the overall structure is more solid and has a strong load-bearing capacity.

[0077] Moreover, by placing the four upper telescopic arms 5 along the diagonal direction of the central support seat 1, the present application can stretch and lock the four bolts in the cross direction at the same time, which not only improves the work efficiency, but also makes the stretching and locking force more uniform.

[0078] Further, if Figure 12 As shown, the four upper telescopic arms 5 and the lower telescopic arms 2 are all slidably set on the top and top of the central support seat 1 through the slide rail assembly 68; by setting the slide rail assembly 68, the present application not only makes the telescopic arm extension and retraction process smoother, but also reduces wear and tear and increases service life.

[0079] Further, if Figure 12 As shown, the connecting frame 4 includes a connecting plate 41 vertically arranged at the outer end of the lower telescopic arm 2, a fan-shaped connecting plate 42 horizontally arranged 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 arranged at the bottom of the fan-shaped connecting plate 42 for supporting 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 in the inner ring of the pitch bearing. By passing a fastener through the elongated holes 421 and the threaded holes in the inner ring of the pitch bearing, the fan-shaped connecting plate 42 can be fixed to the side of the inner ring of the pitch bearing;

[0080] During operation: according to the diameter of the inner ring of the pitch bearing, the lower drive module 3 is used to simultaneously drive multiple lower telescopic arms 2 to extend and retract synchronously until the fan-shaped positioning plate 43 is against the inner wall of the inner ring of the pitch bearing, and then the fastener is passed through the long hole 421 and the threaded hole of the inner ring of the pitch bearing to fix the fan-shaped connecting plate 42 on the side of the inner ring of the pitch bearing, and the installation is completed.

[0081] Further, if Figure 2 As shown, a hoisting portion 12 is provided on the top of the central support seat 1, which is convenient for lifting the device by a crane or the like and installing it on or removing it from the inner ring of the pitch bearing.

[0082] Further, if Figure 1As shown, at least three support legs 13 are evenly distributed in the circumferential direction and placed vertically at the bottom of the central support base 1; the height of the support legs 13 is higher than 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 the lower drive module 3, the device can be placed stably on the ground or platform.

[0083] Further, if Figure 13 As shown, it also includes a hydraulic pump station 14 for providing pressure to the intelligent stretcher, wherein the hydraulic pump station 14 and the telescopic arm are staggered and respectively installed on the side of the central support base 1.

[0084] Further, if Figure 2 As shown, the device further includes a controller 10 for controlling the entire device; the controller 10 is arranged on the top of the upper drive module 6.

[0085] The above are only specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. Any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the scope of protection of the present invention.

Claims

1. A semi-automatic bolt tensioning device for wind turbine pitch bearings, characterized by: The telescopic arm comprises 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 circumferential direction, a lower driving module arranged at the center of the bottom of the central support base for simultaneously driving multiple lower telescopic arms to extend and retract synchronously, connecting frames respectively arranged at the outer ends of the lower telescopic arms for connecting to the inner rings of the pitch bearings, an upper telescopic arm radially arranged above the support template, an upper driving module arranged at the top of the central support base for driving the upper telescopic arm, and a stretching module arranged at the outer ends of the upper telescopic arms; The stretching module includes a vertically placed Z-axis linear module, a quick-change mechanism arranged at the driving end of the Z-axis linear module, a floating mechanism arranged on the quick-change module, an intelligent stretcher vertically arranged on the floating mechanism, and a visual positioning module for identifying the bolt position on the pitch bearing.

2. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1 is characterized in that: It also includes an X-axis linear module and a pre-stretching module arranged at the outer end of the upper telescopic arm; The X-axis linear module is horizontally arranged and vertically connected to the outer end of the upper telescopic arm; the X-axis linear module is a double-slide linear module, in which the two slides are symmetrically arranged on the linear module and move closer or farther away at the same time under the drive of the linear module; The stretching module and the pre-stretching module are respectively arranged on two slides; The pre-stretching module also includes a vertically placed Z-axis linear module, a quick-change mechanism arranged at the driving end of the Z-axis linear module, and a floating mechanism arranged on the quick-change module. The difference from the stretching module is that a nut tightener is vertically arranged on the floating mechanism.

3. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1 or 2, characterized in that: The floating mechanism includes a vertically placed floating seat, cantilever floating assemblies respectively arranged on both sides of the top of the floating seat, and a rotating support assembly arranged on the floating seat and located below the cantilever floating assembly; The cantilever floating assembly includes a guide rod placed perpendicular to the floating seat, a slider slidably arranged 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 sides of the intelligent stretcher or nut tightener are respectively connected to the slider; The rotary support assembly is a hinge structure, one end of which is rotatably connected to the floating seat, and the other end is connected to the lower part of the intelligent stretcher or nut tightener through a fastener.

4. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 3 is characterized in that: The cantilever floating assembly also includes a connecting seat and a limit block; the connecting seat is used to connect the rod-end fisheye bearing and the floating seat; the limit block is installed on the connecting seat, and a limit hole is formed between the limit block and the connecting seat; the aperture of the limit 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 movable range of the rod-end fisheye bearing.

5. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 4 is 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 member; The quick-change mechanism is used to connect the driven slide and the floating seat.

6. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1, characterized in that: There are at least two upper telescopic arms, which are evenly distributed along the circumference of the pitch bearing; The upper drive module is arranged at the top center of the central support base, and is used to drive multiple upper telescopic arms to extend and retract synchronously at the same time; The upper drive module and the lower drive module have the same structure, but are placed symmetrically up and down, and both include a drive bracket, a rotating shaft vertically passing through the center of the drive bracket, a driver arranged on the drive bracket for driving the rotating shaft, a driving bevel gear sleeved on the rotating shaft, a plurality of screws extending into the telescopic arm and threadedly connected to the inner end of the telescopic arm, and a plurality of driven bevel gears arranged at the ends of the screws and all meshing with the driving bevel gear.

7. The semi-automatic bolt tensioning device for wind turbine pitch bearings according to claim 1, characterized in that: The plurality of upper telescopic arms and lower telescopic arms are all slidably arranged on the top and the top of the central support seat through a slide rail assembly.

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

9. 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 arranged at the outer end of the lower telescopic arm, a fan-shaped connecting plate arranged on the top of the connecting plate and installed on the side of the inner ring of the pitch bearing, and a fan-shaped positioning plate arranged at the bottom of the fan-shaped connecting plate for supporting the inner wall of the inner ring of the pitch bearing; at least two elongated holes corresponding to the threaded holes of the inner ring of the pitch bearing are provided on the fan-shaped connecting plate, and the fan-shaped connecting plate can be fixed to the side of the inner ring of the pitch bearing by passing a fastener through the elongated hole and the threaded hole.

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

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