Stretching tool and stretching method for connecting bolt of variable pitch bearing and hub

Abstract

The invention provides a stretching tool and stretching method for a connecting bolt of a variable pitch bearing and a hub. The stretching tool comprises a supporting frame, a rotating beam arranged on the supporting frame and a stretcher support arranged on the rotating beam. The supporting frame can be detachably installed on an inner ring of a variable-pitch bearing, the central axis of the supporting frame is made to coincide with the central axis of the variable-pitch bearing, the rotating beam can rotate around the central axis of the supporting frame so as to adjust the circumferential position of the stretcher support, and the stretcher support can be provided with a stretcher. And the radial distance between the tensioner bracket and the central axis of the supporting frame corresponds to the radial distance between the bolt hole of the outer ring of the variable-pitch bearing and the central axis of the variable-pitch bearing. According to the technical scheme, the tensioner does not need to be manually supported or manually held to move to each bolt hole, so that the labor intensity is reduced, the stability of the tensioner is ensured, and the assembly efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind turbines, and in particular to a stretching tool for connecting bolts between a pitch bearing and a hub, and to a stretching method for connecting bolts between a pitch bearing and a hub. Background Art

[0002] The trend of large-scale products in the wind power industry has become the main theme of development. The large wind turbines continuously launched by wind power equipment manufacturers have made the diameter of the variable pitch bearing of large megawatt wind turbine generator sets exceed 3.5 meters, and the number of mounting bolts connected to the hub exceeds 360, which has increased the difficulty of the hub assembly process. The hub and the variable pitch bearing are connected by stud bolts, and a bolt tensioner is required to tighten the variable pitch bearing bolts. At the same time, two tensioners are used to tighten them in a cross-shaped manner, and then divided into M-shaped partitions, and the fastening bolts of the hub and the variable pitch bearing are tightened diagonally and synchronously. They are tightened in three times, namely initial stretching, intermediate stretching and final stretching. A bolt tensioner weighs more than ten or even dozens of kilograms. Two people are required to lift the tensioner at the same time and climb the ladder to perform the stretching operation. A stretching operation on three surfaces of a hub takes about 3 hours. The entire variable pitch bearing bolts are tightened to meet the preload torque requirements, which needs to be completed within 48 hours. Traditional manual operation causes high labor intensity and low assembly efficiency. Bolt tightening may have problems such as inability to synchronize the axis diagonally. Summary of the invention

[0003] A technical problem to be solved by the present disclosure is that the existing technology for installing a variable pitch bearing has high strength and low assembly efficiency.

[0004] To solve the above technical problems, an embodiment of the present disclosure provides a stretching tool for connecting bolts of a pitch bearing and a hub, wherein the tool comprises a support frame, a rotating beam arranged on the support frame, and a stretcher bracket arranged on the rotating beam, wherein the support frame can be detachably mounted on the inner ring of the pitch bearing and make the central axis of the support frame coincide with the central axis of the pitch bearing, the rotating beam can rotate around the central axis of the support frame to adjust the circumferential position of the stretcher bracket, the stretcher bracket can be installed with a stretcher, and the radial distance between the stretcher bracket and the central axis of the support frame corresponds to the radial distance between the bolt hole of the outer ring of the pitch bearing and the central axis of the pitch bearing.

[0005] In some embodiments, a plurality of bearing connecting plates are also included, wherein the radial outer end of the bearing connecting plate can be detachably connected to the bolt hole of the inner ring of the pitch bearing, and the radial inner end of the bearing connecting plate is provided with a radially extending first waist-shaped hole, and the bearing connecting plate can be connected to the support frame through the first waist-shaped hole.

[0006] In some embodiments, the support frame is formed into a triangular structure, and three corners of the support frame can be connected to the pitch bearing through the bearing connecting plate.

[0007] In some embodiments, a damping shaft assembly is further included, and the rotating beam is rotatably mounted on the supporting frame through the damping shaft assembly.

[0008] In some embodiments, the midpoint of the rotating beam is rotatably connected to the support frame, and the stretcher brackets are respectively provided at both ends of the rotating beam.

[0009] In some embodiments, it also includes an adjustment seat arranged at the end of the rotating beam, the adjustment seat is provided with a strip hole extending parallel to the central axis direction of the support frame, and the stretcher bracket is arranged on the adjustment seat and can move along the strip hole.

[0010] In some embodiments, it also includes a beam connecting plate connected to the end of the rotating beam, the beam connecting plate is provided with a radially extending second waist-shaped hole, and the adjustment seat is connected to the beam connecting plate through the second waist-shaped hole.

[0011] In some embodiments, the stretcher support includes a tube portion having a C-shaped cross-section for accommodating the stretcher.

[0012] In some embodiments, a stretcher is further included that is disposed in the stretcher support.

[0013] On the other hand, the embodiments of the present disclosure further disclose a method for stretching the connecting bolts between the variable pitch bearing and the hub, wherein the stretching tooling for the connecting bolts between the variable pitch bearing and the hub described above is used.

[0014] Through the above technical solution, the tensioner no longer requires human support or human grip to move to each bolt hole, which reduces labor intensity, ensures the stability of the tensioner, improves assembly efficiency, and enables bolts on the same diameter to be tightened synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a front view of a stretching tool for connecting bolts of a pitch bearing and a hub according to an embodiment of the present disclosure; Figure 2is a side view of a stretching tool for connecting bolts of a pitch bearing and a hub according to an embodiment of the present disclosure; Figure 3 is a schematic structural diagram of a rotating beam disclosed in an embodiment of the present disclosure; Figure 4 It is a structural schematic diagram of the adjustment seat disclosed in the embodiment of the present disclosure; Figure 5 is a schematic structural diagram of a stretcher bracket disclosed in an embodiment of the present disclosure; Figure 6 It is a structural schematic diagram of the cooperation between the stretching fixture of the connecting bolts of the variable pitch bearing and the hub and the variable pitch bearing disclosed in the embodiment of the present disclosure; Figure 7 It is a schematic diagram of the tensioning sequence of the bolts of the variable pitch bearing disclosed in the embodiment of the present disclosure.

[0017] Description of reference numerals: 1-bearing connecting plate, 2-support frame, 3-rotating beam, 4-beam connecting plate, 5-tensioner, 6-adjusting seat, 7-tensioner bracket, 8-damping shaft assembly, 9-inner ring, 10-outer ring. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0019] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0020] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0021] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0022] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0023] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0024] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0025] The present solution provides a stretching tool for connecting bolts between a pitch bearing and a hub, which includes a support frame 2, a rotating beam 3 arranged on the support frame 2, and a stretcher bracket 7 arranged on the rotating beam 3. The support frame 2 can be detachably installed on the inner ring of the pitch bearing and make the central axis of the support frame 2 coincide with the central axis of the pitch bearing. The rotating beam 3 can rotate around the central axis of the support frame 2 to adjust the circumferential position of the stretcher bracket 7. The stretcher bracket 7 can be installed with a stretcher, and the radial distance between the stretcher bracket 7 and the central axis of the support frame 2 corresponds to the radial distance between the bolt hole of the outer ring of the pitch bearing and the central axis of the pitch bearing.

[0026] The stretching tooling for the connecting bolts of the pitch bearing and the hub mainly includes a support frame 2, a rotating beam 3 and a tensioner bracket 7. The support frame 2 can be installed on the inner ring 9 of the pitch bearing, and after installation, the central axis of the support frame 2 coincides with the central axis of the pitch bearing, and the rotating beam 3 can rotate relative to the support frame 2 around the central axis of the support frame 2. The radial distance between the tensioner bracket 7 and the central axis of the support frame 2 corresponds to the radial distance between the bolt hole on the outer ring 10 of the pitch bearing and the central axis of the pitch bearing. That is to say, after the support frame 2 is installed on the inner ring 9 and the tensioner bracket 7 is installed with the tensioner 5, the radial distance between the tensioner 5 and the central axis of the pitch bearing is basically the same as the radial distance between the bolt hole on the outer ring 10 and the central axis of the pitch bearing, so as to facilitate the stretching of the bolts in the bolt holes on the outer ring 10 by the tensioner 5.

[0027] It can be seen that after the support frame 2 is installed on the inner ring 9, it can provide stable support for the tensioner bracket 7 and the tensioner 5, and manpower is no longer needed to provide support for the tensioner 5, which not only reduces the labor intensity, but also ensures the stability of the tensioner 5. In addition, the rotating beam 3 can rotate around the central axis of the variable pitch bearing, so that the tensioner 5 moves to each bolt hole in the circumferential direction of the outer ring 10, and there is no need for the operator to hold the tensioner 5 and move it to the target bolt hole, which further reduces the labor intensity and allows the tensioner 5 to rotate quickly, thereby improving the assembly efficiency.

[0028] In this solution, the stretcher no longer requires human support or human grip to be moved to each bolt hole, which reduces labor intensity, ensures the stability of the stretcher, and improves assembly efficiency.

[0029] In addition, in some embodiments, the stretching tooling for connecting bolts between the pitch bearing and the hub further includes a plurality of bearing connecting plates 1, the radial outer ends of the bearing connecting plates 1 can be detachably connected to the bolt holes of the inner ring of the pitch bearing, the radial inner ends of the bearing connecting plates 1 are provided with radially extending first waist-shaped holes, and the bearing connecting plates 1 can be connected to the support frame 2 through the first waist-shaped holes. The radial outer ends of the bearing connecting plates 1 can be provided with at least one through hole, which is aligned with the bolt holes on the inner ring 9 and connected by bolts; the radial inner ends of the bearing connecting plates 1 are provided with the first waist-shaped holes, and the outer peripheral edges of the support frame 2 are provided with through holes corresponding to the first waist-shaped holes, and according to the inner diameter of the inner ring 9 and the outer peripheral size of the support frame 2, the through holes correspond to the appropriate positions of the first waist-shaped holes, and then the support frame 2 and the bearing connecting plates 1 are connected by bolts through the first waist-shaped holes and the through holes, thereby fixing the support frame 2 on the inner ring 9. For inner rings 9 with different inner diameters, the through holes on the support frame 2 correspond to different positions of the first waist-shaped holes. Therefore, the stretching tooling can be applicable to variable pitch bearings with different inner diameters. In addition, a variety of different types of bearing connecting plates 1 can also be provided, which have different radial lengths and first waist-shaped holes of different sizes, so that the stretching tooling can be applicable to more variable pitch bearings of different sizes.

[0030] The support frame 2 is formed into a triangular structure, and the three corners of the support frame 2 can be connected to the pitch bearing through the bearing connecting plate 1. Figure 1 As shown, the support frame 2 is generally formed into a triangular plate-like structure, and can further be formed into an equilateral triangle shape. Each corner of the support frame 2 is connected to the pitch bearing through a bearing connecting plate 1 to ensure the stability of the connection between the support frame 2 and the pitch bearing.

[0031] In addition, in some embodiments, the stretching tooling for the connecting bolts between the pitch bearing and the hub also includes a damping shaft assembly 8, and the rotating beam 3 is rotatably mounted on the support frame 2 through the damping shaft assembly 8. The damping shaft assembly 8 is mounted at the central axis of the support frame 2, and the rotating beam 3 is mounted on the damping shaft assembly 8 to allow the rotating beam 3 to rotate relative to the support frame 2 around the central axis of the support frame 2. The damping shaft assembly 8 can provide a damping force for the rotation of the rotating beam 3 relative to the support frame 2, increase the resistance to the rotation of the support frame 2, and make it easier to keep it fixed relative to the support frame 2. In this case, when the rotating beam 3 is rotated to a suitable angle, when the tensioner 5 is used for operation, it can be prevented that the rotating beam 3 rotates again accidentally, thereby affecting the tensioning operation of the tensioner 5 on the bolts.

[0032] Among them, in some embodiments, the midpoint of the rotating beam 3 is rotatably connected to the support frame 2, and the tensioner brackets 7 are respectively provided at both ends of the rotating beam 3. Two tensioner brackets 7 are provided on the rotating beam 3. After the rotating beam 3 is rotated to a suitable angle, two bolts that are symmetrical about the central axis can be stretched synchronously by two tensioners 5 at the same time, which can ensure the force balance of the outer ring 10 and the stretching tooling, and solve the problem of unbalanced torque of bolts on the same diameter that may exist in the bolt tightening operation. It can be seen that the extension direction of the rotating beam 3 always corresponds to one of the diameters of the variable pitch bearing, and two bolts on the same diameter can be stretched synchronously to ensure that the bolts on the same diameter can be tightened synchronously.

[0033] In addition, in some embodiments, the tensioning tooling for connecting the pitch bearing and the hub with bolts further includes an adjustment seat 6 disposed at the end of the rotating beam 3, the adjustment seat 6 is provided with a strip hole extending parallel to the central axis direction of the support frame 2, and the tensioner bracket 7 is disposed on the adjustment seat 6 and can move along the strip hole. Figure 4 As shown, two strip holes are provided on the adjustment seat 6, and the tensioner bracket 7 is installed in the two strip holes by bolts, so that the tensioner bracket 7 and the tensioner 5 can be allowed to move along the length direction of the strip holes, that is, the tensioner 5 moves in a direction parallel to the central axis of the pitch bearing. For example, before the stretching starts, the tensioner is first placed in the bolt position, and then the tensioner is pushed in to contact the end face of the pitch bearing, and then the bolt is stretched and the nut is torque-locked. After the torque value required by the process is reached, the tensioner is withdrawn along the bolt to move to other bolt positions, wherein the withdrawal distance is greater than the protruding length of the bolt.

[0034] In addition, in some embodiments, the stretching tooling of the connecting bolts between the pitch bearing and the hub also includes a beam connecting plate 4 connected to the end of the rotating beam 3, and the beam connecting plate 4 is provided with a second waist-shaped hole extending radially, and the adjustment seat 6 is connected to the beam connecting plate 4 through the second waist-shaped hole. The beam connecting plate 4 can be welded or bolted to the rotating beam 3, and a second waist-shaped hole is also provided thereon. The adjustment seat 6 can be connected to a suitable position of the second waist-shaped hole by bolts, wherein, by connecting to different positions of the second waist-shaped hole, the radial distance between the adjustment seat 6 and the central axis of the support frame 2 can be different, so as to be suitable for outer rings 10 with different inner diameters. In addition, different types of beam connecting plates 4 and / or rotating beams 3 can be prepared for different types of pitch bearings.

[0035] In addition, in some embodiments, the stretcher support 7 includes a tube portion with a C-shaped cross-section for accommodating the stretcher. Figure 5 As shown, the pipe portion has a C-shaped cross section, which can accommodate a substantially cylindrical tensioner 5, which can be fixed in the pipeline by bolts.

[0036] In addition, in some embodiments, the stretching tooling for the connecting bolts between the pitch bearing and the hub further includes a stretcher 5 disposed in the stretcher bracket 7 .

[0037] On the other hand, the present invention provides a method for stretching the connecting bolts between the pitch bearing and the wheel hub, wherein the stretching tool for the connecting bolts between the pitch bearing and the wheel hub described in the above embodiment is used. Specifically, before using the tool, the pitch bearing has been installed on the wheel hub, and all the bolts and nuts have been installed in place; the support frame 2 is fixed on the inner ring 9 of the pitch bearing, and the relative positions of the beam connecting plate 4 and the adjusting seat 6 are adjusted so that the central axis of the bolts on the outer ring 10 of the tensioner 5 are aligned; the rotating beam 3 is rotated so that the tensioner 5 is aligned with the outer ring 10 of the tensioner 5 ... Figure 7 Position 1 (the number on the outer circle) as shown is aligned to initially stretch and tighten the bolt at position 1, withdraw the tensioner 5 from the bolt, rotate the rotating beam 3 to initially stretch and tighten the bolts at positions 2, 3, and 4 in turn, divide the bolts on the outer circle 10 into 8 areas, and then stretch the bolts in the 8 areas in turn. The 8 areas (divided into 4 groups, two areas in each group) are initially stretched and tightened. The stretching order of each area is from the center to one side and then from the center to the other side. Refer to Figure 7 The numbers of the inner circle in the figure. After the initial stretching is completed, 4-5 hours later, the intermediate stretching and final stretching are performed according to the above steps. So far, the various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0038] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A stretching tool for connecting bolts between a pitch bearing and a hub, characterized in that: The invention comprises a support frame (2), a rotating beam (3) arranged on the support frame (2), and a tensioner bracket (7) arranged on the rotating beam (3); the support frame (2) can be detachably mounted on the inner ring of a pitch bearing and the central axis of the support frame (2) is made to coincide with the central axis of the pitch bearing; the rotating beam (3) can rotate around the central axis of the support frame (2) to adjust the circumferential position of the tensioner bracket (7); the tensioner bracket (7) can be mounted with a tensioner; and the radial distance between the tensioner bracket (7) and the central axis of the support frame (2) corresponds to the radial distance between the bolt hole of the outer ring of the pitch bearing and the central axis of the pitch bearing.

2. The stretching tool for connecting bolts of a pitch bearing and a hub according to claim 1, characterized in that: It also comprises a plurality of bearing connection plates (1), wherein the radial outer ends of the bearing connection plates (1) can be detachably connected to the bolt holes of the inner ring of the pitch bearing, and the radial inner ends of the bearing connection plates (1) are provided with radially extending first waist-shaped holes, and the bearing connection plates (1) can be connected to the support frame (2) through the first waist-shaped holes.

3. The stretching tool for connecting bolts of a pitch bearing and a hub according to claim 2, characterized in that: The support frame (2) is formed into a triangular structure, and the three corners of the support frame (2) can be connected to the pitch bearing through the bearing connecting plate (1).

4. The stretching tool for connecting bolts of a pitch bearing and a hub according to claim 1, characterized in that: It also comprises a damping shaft assembly (8), and the rotating beam (3) is rotatably mounted on the supporting frame (2) via the damping shaft assembly (8).

5. The stretching tool for connecting bolts of a pitch bearing and a hub according to claim 1, characterized in that: The midpoint of the rotating beam (3) is rotatably connected to the support frame (2), and the stretcher brackets (7) are respectively provided at both ends of the rotating beam (3).

6. The stretching tool for connecting bolts of a pitch bearing and a hub according to claim 1, characterized in that: It also comprises an adjustment seat (6) arranged at the end of the rotating beam (3), the adjustment seat (6) being provided with a strip hole extending parallel to the central axis direction of the support frame (2), and the stretcher bracket (7) being arranged on the adjustment seat (6) and being movable along the strip hole.

7. The stretching tool for connecting bolts of a pitch bearing and a hub according to claim 6, characterized in that: It also comprises a beam connection plate (4) connected to the end of the rotating beam (3), the beam connection plate (4) being provided with a second waist-shaped hole extending radially, and the adjustment seat (6) being connected to the beam connection plate (4) via the second waist-shaped hole.

8. The stretching tool for connecting bolts of a pitch bearing and a hub according to claim 1, characterized in that: The stretcher bracket (7) comprises a tube portion with a C-shaped cross section for accommodating the stretcher.

9. The stretching tool for connecting bolts of a pitch bearing and a hub according to claim 1, characterized in that: Also included is a stretcher (5) arranged in the stretcher bracket (7).

10. A method for stretching the connecting bolts between a pitch bearing and a hub, characterized in that: A stretching tool for connecting bolts of a pitch bearing and a hub as described in any one of claims 1 to 9 is used.

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