Crack detection device applied to variable pitch bearing and wind generating set

Abstract

The utility model provides a crack detection device applied to a variable pitch bearing and a wind generating set, and relates to the technical field of wind power generation. The crack detection device applied to the variable pitch bearing comprises two fixing mechanisms which are arranged at an interval, and the fixing mechanisms are used for being arranged on the peripheral side of the variable pitch bearing of the wind generating set in a sleeving mode; the two sliding mechanisms are arranged at an interval, each sliding mechanism is correspondingly arranged on the peripheral side of each fixing mechanism in a sleeving mode, and each sliding mechanism is correspondingly connected with each fixing mechanism in a sliding mode; the at least two bearing parts are connected with the two adjacent sliding mechanisms; the crack detection piece is arranged on a bearing piece; the sliding mechanism slides relative to the fixed mechanism to drive the bearing part and the crack detection part to move in the circumferential direction of the variable-pitch bearing so as to carry out crack detection on the circumferential surface of the variable-pitch bearing. The crack detection device applied to the variable pitch bearing is accurate in crack detection result and high in efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, and in particular to a crack detection device applied to a variable pitch bearing and a wind power generator set. Background Art

[0002] The pitch bearing is a key component that connects the blades and the hub of a wind turbine. It is mainly used to adjust the angle of the blades so that the blades can adapt to different wind speeds and directions, thereby improving the power generation efficiency of the wind turbine and ensuring the safe operation of the wind turbine. The working environment of the pitch bearing is usually harsh, which may cause the pitch bearing to break. In order to ensure the safe operation of the pitch bearing, crack detection of the pitch bearing is required.

[0003] In the related art, the inspector first cleans the surface of the pitch bearing and then visually inspects whether there are cracks on the surface of the pitch bearing.

[0004] However, crack detection by manual visual inspection results in inaccurate and inefficient detection. Utility Model Content

[0005] The utility model provides a crack detection device for a variable pitch bearing and a wind turbine generator set, which are used to solve the problem that crack detection by manual visual inspection leads to inaccurate detection results and low efficiency.

[0006] In a first aspect, the utility model provides a crack detection device for a pitch bearing, comprising:

[0007] Two fixing mechanisms are arranged at intervals, and the fixing mechanisms are used to be sleeved on the peripheral side of the variable pitch bearing of the wind turbine generator set;

[0008] Two sliding mechanisms are arranged at intervals, each sliding mechanism is correspondingly sleeved on the peripheral side of each fixing mechanism, and each sliding mechanism is correspondingly slidably connected with each fixing mechanism;

[0009] At least two bearing members, the bearing members connecting two adjacent sliding mechanisms;

[0010] A crack detection member, the crack detection member is arranged on a carrier;

[0011] The sliding mechanism slides relative to the fixing mechanism to drive the bearing member and the crack detection member to move along the circumferential direction of the variable pitch bearing to perform crack detection on the circumferential surface of the variable pitch bearing.

[0012] In a possible implementation, the fixing mechanism includes two fixing members, and the two fixing members are detachably connected;

[0013] The sliding mechanism includes two sliding components, and the two sliding components are detachably connected;

[0014] Each sliding assembly is correspondingly slidably connected to each fixing member.

[0015] In a possible embodiment, the sliding assembly includes a sliding member and a plurality of ball bearings, one of the fixed member and the sliding member has a plurality of ball bearing grooves, and the other has an annular groove, and each ball bearing is correspondingly arranged between each ball bearing groove and the annular groove.

[0016] In a possible implementation, the crack detection device applied to the pitch bearing further includes at least two first fasteners;

[0017] The fixing member is provided with at least two first through holes, the sliding member is provided with at least two second through holes, and each first fastener passes through each first through hole and each second through hole in sequence to fasten the fixing member and the sliding member.

[0018] In a possible implementation, one of the two fixing members has a first protrusion, and the other has a first groove;

[0019] One of the two sliding components has a second protrusion, and the other has a second groove;

[0020] The first protrusion is inserted into the first groove to connect the two fixing members, and the second protrusion is inserted into the second groove to connect the two sliding components.

[0021] In a possible implementation, the two sliding mechanisms have a seventh through hole on one surface facing the carrier, the carrier has two third protrusions, and the two third protrusions are correspondingly inserted into the seventh through holes to connect the two sliding mechanisms.

[0022] In a possible implementation manner, the carrier has an eighth through hole, and the crack detection component is inserted into the eighth through hole.

[0023] In a possible implementation manner, there are multiple bearing members, and the multiple bearing members are connected between the two sliding mechanisms at intervals.

[0024] In a possible implementation, the crack detection device applied to the pitch bearing further includes at least two spaced-apart connection mechanisms, each of which is used to connect one of the two fixing mechanisms to the hub of the wind turbine generator set.

[0025] In a second aspect, the utility model provides a wind turbine generator set, comprising:

[0026] dynamo;

[0027] A coupling, which is connected to the generator;

[0028] A gear box, which is connected to the coupling;

[0029] A main shaft, which is connected to the gear box;

[0030] A wheel hub, which is connected to the main shaft;

[0031] Pitch bearing, the pitch bearing is connected to the hub;

[0032] Blades, which are connected to the pitch bearing;

[0033] In any crack detection device applied to a pitch bearing provided in the first aspect, the fixing mechanism of the crack detection device is sleeved on the circumferential side of the pitch bearing, and the crack detection member of the crack detection device is used to perform crack detection on the circumferential surface of the pitch bearing.

[0034] The utility model provides a crack detection device for a variable pitch bearing and a wind turbine generator set. The crack detection device for a variable pitch bearing is provided by arranging two mutually spaced fixing mechanisms, the fixing mechanisms are sleeved on the circumferential side of the variable pitch bearing of the wind turbine generator set, and the variable pitch bearing can support the fixing mechanisms; by arranging two mutually spaced sliding mechanisms, each sliding mechanism is correspondingly sleeved on the circumferential side of each fixing mechanism, and each sliding mechanism is correspondingly slidably connected with each fixing mechanism, so that the fixing mechanism can support the sliding mechanism, and the sliding mechanism can move along the circumferential direction of the variable pitch bearing; by arranging at least two bearing members, the bearing members connect two adjacent sliding mechanisms, so that the two sliding mechanisms form a whole and support the bearing members, and when the sliding mechanism slides relative to the fixing mechanism, the sliding mechanism can drive the bearing member to move along the circumferential direction of the variable pitch bearing; by arranging a crack detection member, the crack detection member is arranged on a bearing member, so that the bearing member can drive the crack detection member to move along the circumferential direction of the variable pitch bearing, so that the crack detection member can perform crack detection on the variable pitch bearing on the circumferential surface of the variable pitch bearing. Compared with manual visual inspection of cracks, the detection results of using crack detection parts are more accurate. In addition, the crack detection part can complete the crack detection of the variable pitch bearing by sliding one circle along the circumferential surface of the variable pitch bearing, and the detection efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0036] Figure 1 A schematic diagram of the structure of a wind turbine generator set provided by an embodiment of the utility model;

[0037] Figure 2 for Figure 1 A in the enlarged view;

[0038] Figure 3 for Figure 2A schematic diagram of the structure of a crack detection device applied to a pitch bearing;

[0039] Figure 4 for Figure 3 A schematic diagram of a structure in which a sliding mechanism is connected to a fixing mechanism;

[0040] Figure 5 for Figure 3 A schematic diagram of another structure in which a sliding mechanism is connected to a fixing mechanism;

[0041] Figure 6 for Figure 5 A schematic diagram of the structure of the fixing parts;

[0042] Figure 7 for Figure 5 A schematic diagram of the structure of the middle sliding member;

[0043] Figure 8 for Figure 5 Exploded diagram of

[0044] Fig. 9 for Figure 3 Exploded view of the connection between the medium crack detection component and the load-bearing component.

[0045] Description of reference numerals:

[0046] 10-hub; 20-pitch bearing; 30-blade; 40-wind turbine nacelle; 50-tower; 60-crack detection device;

[0047] 100-fixing mechanism; 110-fixing member; 120-ball groove; 130-first through hole; 140-first protrusion; 150-first groove; 160-third through hole; 170-fourth through hole;

[0048] 200-sliding mechanism; 210-sliding assembly; 211-sliding member; 212-ball; 213-annular groove; 214-second through hole; 215-second protrusion; 216-second groove; 217-fifth through hole; 218-sixth through hole;

[0049] 300-carrying member; 310-third protrusion; 320-eighth through hole;

[0050] 400-crack detection parts;

[0051] 500-first fastener;

[0052] 600-second fastener;

[0053] 700-connecting mechanism; 710-magnetic member;

[0054] 800 - Third fastener.

[0055] To facilitate understanding of the scheme of the utility model, the spline curves and arrows used in the drawings are explained here: the parts indicated by the spline curves without arrows are solid parts, that is, parts with solid structures; the parts indicated by the spline curves with arrows are virtual parts, that is, parts without solid structures.

[0056] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the present utility model, it should be understood that the orientation or position relationship (if any) indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 utility model. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the phrase "comprising..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements. If there is no conflict, the embodiments of the utility model and the various features in the embodiments can be combined with each other, all within the protection scope of the utility model.

[0059] Wind turbines can convert wind energy into mechanical energy, and then convert mechanical energy into electrical energy to supply power to the power grid or specific electrical equipment.

[0060] Wind turbines can be divided into horizontal-axis wind turbines (horizontal rotation) and vertical-axis wind turbines (vertical rotation) according to the different ways in which the blades rotate. The utility model is described by taking a horizontal-axis wind turbine as an example.

[0061] Figure 1 A schematic diagram of the structure of a wind turbine generator set provided by an embodiment of the utility model, Figure 2 for Figure 1 Enlarged view of point A in .

[0062] See also Figure 1 A horizontal axis wind turbine generator set usually includes a plurality of blades 30, a hub 10, a main shaft (not shown), a gear box (not shown), a coupling (not shown) and a generator (not shown), among which a plurality of blades 30 are spaced and evenly connected to the hub 10 along the radial direction of the main shaft. The hub 10 is arranged on the main shaft, and the main shaft is connected to the generator through a gear box and a coupling. When wind blows through the blades 30, the blades 30 rotate and drive the hub 10 and the main shaft to rotate. The main shaft transmits mechanical energy to the generator through the gear box and the coupling. The generator converts the mechanical energy into electrical energy for supplying power to a power grid or specific electrical equipment. The electrical energy converted by the generator can be alternating current or direct current.

[0063] Furthermore, the wind turbine generator set further includes a tower 50 and a wind turbine nacelle 40 disposed on the tower 50. The tower 50 is disposed on the ground and can raise the wind turbine nacelle 40 to a position suitable for capturing higher wind speeds. Devices such as a generator, a coupling, and a gearbox are usually disposed in the wind turbine nacelle 40. The main shaft is connected to the gearbox and extends to the outside of the wind turbine nacelle 40. The hub 10 is connected to the main shaft outside the wind turbine nacelle 40. The blades 30 are connected to the hub 10 to capture the wind.

[0064] Further, see Figure 2 The wind turbine generator set also includes a pitch bearing 20, which connects the blade 30 and the hub 10, and is mainly used to adjust the angle of the blade 30 so that the blade 30 can adapt to different wind speeds and wind directions, thereby improving the power generation efficiency of the wind turbine generator set and ensuring the safe operation of the wind turbine generator set. The working environment of the pitch bearing 20 is usually relatively harsh, because the size and direction of the load acting on the blade 30 are constantly changing over time, and the pitch bearing 20 is always subjected to alternating loads. The force condition of the pitch bearing 20 is complex, and the impact and vibration of the pitch bearing 20 are relatively large. After a long period of operation, the pitch bearing 20 may break, especially at the bolt holes used to connect the blades 30. Therefore, in order to ensure the safe operation of the pitch bearing 20, it is necessary to perform crack detection on the pitch bearing 20.

[0065] In the related art, the inspector first cleans the surface of the pitch bearing 20 to ensure that there is no interference from impurities or dirt, and then visually inspects whether there are cracks on the surface of the pitch bearing 20.

[0066] However, crack detection by manual visual inspection results in inaccurate and inefficient detection.

[0067] Specifically, the visual judgment of the human eye is easily affected by subjective factors. Different inspectors may have different judgment standards and subjective biases, resulting in inconsistent results. In addition, the human eye has limited perception of tiny cracks and may miss or misjudge some tiny cracks, thus reducing the accuracy of the inspection.

[0068] Manual visual inspection requires inspectors to carefully observe every area of ​​the surface of the pitch bearing 20, which is a time-consuming and tedious task. Especially for large wind turbines, the surface area of ​​the pitch bearing 20 is large, which requires more time and effort to inspect. This inefficient inspection will increase the time cost of maintenance and repair.

[0069] Figure 3 for Figure 2 Schematic diagram of the structure of the crack detection device used in variable pitch bearings.

[0070] For the above technical issues, please see Figure 2 and Figure 3 The embodiment of the utility model provides a crack detection device 60 for a pitch bearing, comprising: two fixed mechanisms 100 arranged at intervals, the fixed mechanisms 100 are used to be sleeved on the circumferential side of the pitch bearing 20 of the above-mentioned wind turbine generator set; two sliding mechanisms 200 arranged at intervals, each sliding mechanism 200 is correspondingly sleeved on the circumferential side of each fixed mechanism 100, and each sliding mechanism 200 is correspondingly slidably connected to each fixed mechanism 100; at least two bearing members 300, the bearing member 300 connects two adjacent sliding mechanisms 200; a crack detection member 400, and the crack detection member 400 is arranged on a bearing member 300; the sliding mechanism 200 slides relative to the fixed mechanism 100 to drive the bearing member 300 and the crack detection member 400 to move along the circumferential direction of the pitch bearing 20, so as to perform crack detection on the circumferential surface of the pitch bearing 20.

[0071] The crack detection device 60 provided by the present invention is provided with two mutually spaced fixing mechanisms 100 , the fixing mechanisms 100 are sleeved on the peripheral side of the variable pitch bearing 20 of the wind turbine generator set, and the variable pitch bearing 20 can support the fixing mechanisms 100 .

[0072] By setting two sliding mechanisms 200 spaced apart from each other, each sliding mechanism 200 is correspondingly sleeved on the circumferential side of each fixing mechanism 100, and each sliding mechanism 200 is correspondingly slidably connected to each fixing mechanism 100, so that the fixing mechanism 100 can support the sliding mechanism 200 and enable the sliding mechanism 200 to move along the circumferential direction of the pitch bearing 20.

[0073] By setting at least two bearing members 300, the bearing members 300 connect two adjacent sliding mechanisms 200, so that the two sliding mechanisms 200 form a whole and support the bearing members 300. When the sliding mechanism 200 slides relative to the fixing mechanism 100, the sliding mechanism 200 can drive the bearing members 300 to move along the circumferential direction of the pitch bearing 20.

[0074] By setting a crack detection member 400, the crack detection member 400 is set on a supporting member 300, so that the supporting member 300 can drive the crack detection member 400 to move along the circumferential direction of the pitch bearing 20, so that the crack detection member 400 can detect cracks on the pitch bearing 20 on the circumferential surface of the pitch bearing 20.

[0075] The crack detector 400 is a tool specifically used for detecting cracks. The crack detector 400 can be a surface defect detection device such as an eddy current flaw detector, an ultrasonic flaw detector, or an infrared thermal imaging flaw detector. The present application does not limit its specific type. It should be noted that the crack detector 400 is a structural design method already existing in the art and will not be described in detail here.

[0076] The crack detection element 400 can detect tiny and fine cracks, even cracks that are difficult to detect with the naked eye, thereby providing more accurate detection results and reducing the possibility of missed detection and misjudgment.

[0077] The crack detection member 400 can complete crack detection in a relatively short time. Compared with manual visual inspection, the crack detection member 400 can scan the pitch bearing 20 by sliding one circle along the circumferential surface of the pitch bearing 20, and can quickly detect the existence of cracks, which can save a lot of time and manpower and improve the efficiency of detection.

[0078] The following is an explanation of the preferred technical solution of the crack detection device 60 of the present invention in conjunction with the accompanying drawings:

[0079] Figure 4 for Figure 3 A structural schematic diagram of the connection between one of the sliding mechanisms and the fixing mechanism.

[0080] In some embodiments, see Figures 2 to 4The fixing mechanism 100 is an integrated structure in the form of a ring, and its shape matches the shape of the pitch bearing 20 so that it can be sleeved on the circumferential side of the pitch bearing 20; the sliding mechanism 200 is also an integrated structure in the form of a ring, and its shape matches the shape of the fixing mechanism 100 so that it can be sleeved on the circumferential side of the fixing mechanism 100.

[0081] The crack detection device 60 shown in this embodiment has at least the following two application scenarios:

[0082] The first method is that when it is necessary to perform crack detection on the pitch bearing 20, the crack detection device 60 is moved to the end of the blade 30 away from the pitch bearing 20, and then the fixing mechanism 100 of the crack detection device 60 is mounted on the blade 30, and the crack detection device 60 is moved on the blade 30 along the direction of the blade 30 approaching the pitch bearing 20 until it moves to the circumference of the pitch bearing 20, and then the crack detection component 400 is driven to scan around the circumference of the pitch bearing 20 to scan the cracks on the pitch bearing 20.

[0083] The second method is to set the crack detection device 60 on the circumference of the pitch bearing 20 when assembling the wind turbine generator set. When the pitch bearing 20 needs to be detected for cracks, the crack detection component 400 can be directly driven to scan around the circumference of the pitch bearing 20 for one circle to complete the crack detection. The detection efficiency is higher. This method does not require the crack detection device 60 to be installed at the specified position first.

[0084] It should be noted that the crack detection member 400 may be driven to move by electronic devices or manually, and the present invention does not limit this.

[0085] Figure 5 for Figure 3 A schematic diagram of a structure in which another sliding mechanism is connected to a fixing mechanism.

[0086] In other embodiments, see Figure 2 , Figure 3 and Figure 5 The fixing mechanism 100 includes two fixing members 110, and the two fixing members 110 are detachably connected; the sliding mechanism 200 includes two sliding assemblies 210, and the two sliding assemblies 210 are detachably connected; each sliding assembly 210 is slidably connected to each fixing member 110, and the bearing member 300 is connected between the sliding assemblies 210 in the two sliding mechanisms 200 arranged at intervals.

[0087] Due to the existence of the blade 30 and the large size of the blade 30, it is not convenient to set the crack detection device 60 on the peripheral side of the pitch bearing 20. Therefore, in this embodiment, by setting two fixing members 110, the two fixing members 110 can be detachably connected and constitute the whole of the fixing mechanism 100. When the fixing mechanism 100 needs to be installed on the peripheral side of the pitch bearing 20, the two fixing members 110 can be disassembled first, so that they are respectively sleeved on the peripheral side of the pitch bearing 20, and then the two fixing members 110 are connected. The manpower cost and time cost of installing the fixing mechanism 100 in this way are relatively low. By setting two sliding assemblies 210, the two sliding assemblies 210 can be detachably connected and constitute the whole of the sliding mechanism 200, and each sliding assembly 210 is correspondingly slidably connected to each fixing member 110. When disassembling or connecting the two fixing members 110, the two sliding assemblies 210 can be disassembled or connected together, so that the two sliding assemblies 210 can also be set on the peripheral side of the pitch bearing 20 in a simpler way.

[0088] Figure 6 for Figure 5 Schematic diagram of the structure of the fixing parts. Figure 7 for Figure 5 Schematic diagram of the structure of the sliding part.

[0089] In some specific embodiments, see further Figure 6 and Figure 7 The sliding assembly 210 includes a sliding member 211 and a plurality of balls 212. One of the fixing member 110 and the sliding member 211 has a plurality of ball grooves 120, and the other has an annular groove 213. Each ball 212 is correspondingly arranged between each ball groove 120 and the annular groove 213. The supporting member 300 is connected between the sliding members 211 of the sliding assembly 210 in the two sliding mechanisms 200 arranged at an interval.

[0090] The structure and principle of this embodiment will be described below by setting a plurality of ball grooves 120 on the fixing member 110 and setting an annular groove 213 on the sliding member 211:

[0091] By providing the ball groove 120, the ball 212 is provided between the ball groove 120 and the annular groove 213, and the ball groove 120 can limit the position of the ball 212 so that the ball 212 can be kept in the ball groove 120; by providing the annular groove 213, the ball 212 can slide in the annular groove 213 along the annular contour of the annular groove 213, so that the sliding member 211 can slide relative to the ball 212, thereby enabling the sliding member 211 to slide relative to the fixed member 110; the ball 212 is spherical The shape of the ball groove 120 is adapted to the shape of a small part of the structure of the ball 212. The ball 212 can rotate in the ball groove 120, so that the ball 212 can rotate relative to the annular groove 213. As a result, the sliding member 211 can rotate relative to the ball 212, which makes the sliding connection between the sliding member 211 and the fixing member 110 smoother and smoother, thereby enabling the bearing member 300 provided with the crack detection member 400 to slide smoothly on the peripheral side of the pitch bearing 20.

[0092] In some other embodiments (not shown in the present embodiment), the sliding assembly 210 includes an annular guide rail and a slider, the slider is disposed on the annular guide rail, the slider can slide along the annular guide rail, and the supporting member 300 is connected between the sliders of the sliding assembly 210 in two sliding mechanisms 200 disposed at intervals.

[0093] It should be noted that the matching structure between the slider and the annular guide rail is a prior art and will not be described in detail here.

[0094] When the sliding assembly 210 includes a sliding member 211 and a plurality of balls 212 , if the sliding mechanism 200 is disassembled into two sliding members 210 , the sliding member 211 may be separated from the fixing member 110 .

[0095] Figure 8 for Figure 5 Exploded diagram.

[0096] For the above technical issues, please see Figure 8 The crack detection device 60 also includes at least two first fasteners 500; the fixing member 110 has at least two first through holes 130, and the sliding member 211 has at least two second through holes 214, and each first fastener 500 passes through each first through hole 130 and each second through hole 214 in sequence to fasten the fixing member 110 and the sliding member 211.

[0097] Before disassembling the two fixing members 110 of the fixing mechanism 100 and the two sliding members 211 of the sliding mechanism 200, two first fasteners 500 are used to fasten the fixing members 110 and the corresponding sliding members 211, so as to prevent the fixing members 110 from being separated from the sliding members 211.

[0098] After the two fixing members 110 are sleeved on the circumferential side of the pitch bearing 20 , the first fastener 500 only needs to be removed, and the sliding member 211 can slide along the circumferential direction of the pitch bearing 20 relative to the corresponding fixing member 110 for crack detection.

[0099] It should be noted that the first through hole 130 is arranged along the radial direction of the fixing member 110, the second through hole 214 is also arranged along the radial direction of the sliding member 211, and the first through hole 130 and the second through hole 214 are arranged correspondingly. In this way, the first fastener 500 can pass through the first through hole 130 and the second through hole 214 in sequence to connect the fixing member 110 and the sliding member 211.

[0100] Exemplarily, the first fastener 500 includes a bolt and a nut, the bolt passes through the first through hole 130 and the second through hole 214 in sequence, and the nut is connected to the bolt on the outside of the sliding member 211 to fasten the fixing member 110 and the sliding member 211 .

[0101] In some embodiments, see Figure 8 , the two fixing members 110 are clamped together, and the two sliding components 210 are clamped together.

[0102] For specific implementation, see Figure 8 , one of the two fixing members 110 has a first protrusion 140, and the other has a first groove 150; one of the two sliding components 210 has a second protrusion 215, and the other has a second groove 216; the first protrusion 140 is inserted into the first groove 150 to connect the two fixing members 110, and the second protrusion 215 is inserted into the second groove 216 to connect the two sliding components 210. Specifically, one of the two sliding members 211 of the sliding component 210 has a second protrusion 215, and the other has a second groove 216.

[0103] It should be noted that the first protrusion 140 is interference fit with the first groove 150 , and the second protrusion 215 is interference fit with the second groove 216 , so as to achieve a fastened connection between the two fixing members 110 and a fastened connection between the two sliding members 211 .

[0104] It should also be noted that after the two fixing members 110 and the two sliding members 211 are connected, the ball 212 is confined between the fixing member 110 and the corresponding sliding member 211, and an integrated structure is formed between the fixing member 110, the ball 212 and the sliding member 211, and no separation will occur.

[0105] In some other embodiments (not shown in the present embodiment), the two fixing members 110 are bonded together, and the two sliding components 210 are bonded together.

[0106] Specifically, a sticky material or an adhesive layer is provided on the surfaces of the two fixing members 110 that are close to each other, and the two fixing members 110 are connected by the sticky material or the adhesive layer.

[0107] The surfaces of the two sliding members 211 that are close to each other are both provided with a sticky material or an adhesive layer, and the two sliding members 211 are connected by the sticky material or the adhesive layer.

[0108] In some other embodiments, please continue to refer to Figure 8 The crack detection device 60 also includes a second fastener 600 and a third fastener 800; one of the two fixing members 110 has a first protrusion 140, the other has a first groove 150 and a third through hole 160 passing through the first groove 150, and the first protrusion 140 has a fourth through hole 170; one of the two sliding components 210 has a second protrusion 215, the other has a second groove 216 and a fifth through hole 217 passing through the second groove 216, and the second protrusion 215 has a sixth through hole 218; the first protrusion 140 is inserted into the first groove 150, the second protrusion 215 is inserted into the second groove 216, the second fastener 600 passes through the fifth through hole 217 and the sixth through hole 218 in sequence to connect the two sliding components 210, and the third fastener 800 passes through the third through hole 160 and the fourth through hole 170 in sequence to connect the two fixing members 110. Specifically, one of the two sliding members 211 of the sliding assembly 210 has a second protrusion 215 , and the other has a second groove 216 .

[0109] In this embodiment, on the basis of the two fixing members 110 being clamped together, the second fastener 600 is used to connect the two fixing members 110, so as to strengthen the connection between the two fixing members 110. On the basis of the two sliding members 211 being clamped together, the third fastener 800 is used to connect the two sliding members 211, so as to strengthen the connection between the two sliding members 211.

[0110] Illustratively, the second fastener 600 and the third fastener 800 each include a bolt and a nut.

[0111] It should be noted that the pitch bearing 20 is generally large in size, and the two fixing members 110 and the two sliding members 211 sleeved outside the pitch bearing are also large in size, so there is enough space for maintenance personnel to install the second fastener 600 and the third fastener 800.

[0112] Fig. 9 for Figure 3 Exploded view of the connection between the medium crack detection component and the load-bearing component.

[0113] In other embodiments, see Figure 2 , Figure 3and Fig. 9 The two sliding mechanisms 200 have a seventh through hole (not shown) on one side facing the carrier 300 , and the carrier 300 has two third protrusions 310 , which are correspondingly inserted into the seventh through hole to connect the two sliding mechanisms 200 .

[0114] In this embodiment, the bearing member 300 is clamped on the two sliding mechanisms 200 via the two third protrusions 310 , and the two sliding mechanisms 200 can drive the bearing member 300 to slide synchronously along the circumferential surface of the pitch bearing 20 .

[0115] For some specific implementations, see Fig. 9 The carrier 300 has an eighth through hole 320 , and the crack detection member 400 is inserted into the eighth through hole 320 .

[0116] The crack detection member 400 can be inserted into the eighth through hole 320 by screw connection, welding or clamping. The utility model does not limit the specific connection method and can be adjusted according to specific needs.

[0117] For other specific implementations, see Figure 3 There are multiple bearing members 300 , and the multiple bearing members 300 are connected between two sliding mechanisms 200 at intervals.

[0118] In this embodiment, the plurality of bearing members 300 can not only strengthen the connection between the two sliding mechanisms 200 , but also provide more installation points for the crack detector 400 , thereby improving the convenience of installing the crack detector 400 .

[0119] The purpose of the fixing mechanism 100 being sleeved on the circumferential side of the pitch bearing 20 is to provide a mounting point for the crack detector 400. There is no very stable connection between the fixing mechanism 100 and the pitch bearing 20. Therefore, the fixing mechanism 100 may be offset relative to the pitch bearing 20, so that the detection point of the crack detector 400 is offset, resulting in inaccurate detection results of the crack detector 400. What is more, if the crack detection device 60 is sleeved on the pitch bearing 20 facing the ground, the fixing mechanism 100 may fall off the pitch bearing 20, so that the maintenance personnel cannot complete the detection work.

[0120] In view of the above technical problems, in some other embodiments, please refer to Figures 1 to 3 The crack detection device 60 further includes at least two spaced connection mechanisms 700 , each connection mechanism 700 being used to connect one of the two fixing mechanisms 100 with the hub 10 of the wind turbine generator set.

[0121] In this embodiment, at least two connecting mechanisms 700 can connect the two fixing mechanisms 100 to the hub 10 , thereby limiting the positions of the two fixing mechanisms 100 to ensure that the two fixing mechanisms 100 will not deviate or fall off relative to the pitch bearing 20 .

[0122] For some specific implementations, please continue to refer to Figure 3 A magnetic member 710 is provided on one end of the connecting mechanism 700 away from the fixing mechanism 100. Since the hub 10 of the wind turbine generator set is usually composed of ferromagnetic materials, when the magnetic member 710 is placed on the hub 10, the magnetic member 710 can be adsorbed on the hub 10, thereby connecting the fixing mechanism 100 to the hub 10.

[0123] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the utility model disclosed herein. The present invention is intended to cover any variation, use or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0124] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A crack detection device for a pitch bearing, characterized in that: include: Two fixing mechanisms are arranged at intervals, and the fixing mechanisms are used to be sleeved on the peripheral side of the variable pitch bearing of the wind turbine generator set; Two sliding mechanisms are arranged at intervals, each of the sliding mechanisms is correspondingly sleeved on the peripheral side of each of the fixing mechanisms, and each of the sliding mechanisms is correspondingly slidably connected with each of the fixing mechanisms; At least two bearing members, wherein the bearing members connect two adjacent sliding mechanisms; A crack detection member, wherein the crack detection member is disposed on one of the carriers; The sliding mechanism slides relative to the fixing mechanism to drive the bearing member and the crack detection member to move along the circumferential direction of the pitch bearing to perform crack detection on the circumferential surface of the pitch bearing.

2. The crack detection device for pitch bearing according to claim 1 is characterized in that: The fixing mechanism comprises two fixing members, and the two fixing members are detachably connected; The sliding mechanism comprises two sliding assemblies, and the two sliding assemblies are detachably connected; Each of the sliding components is correspondingly slidably connected to each of the fixing members.

3. The crack detection device for pitch bearing according to claim 2 is characterized in that: The sliding assembly includes a sliding member and a plurality of balls. One of the fixing member and the sliding member has a plurality of ball grooves, and the other has an annular groove. Each of the balls is correspondingly arranged between each of the ball grooves and the annular groove.

4. The crack detection device for pitch bearing according to claim 3 is characterized in that: Also comprising at least two first fasteners; The fixing member has at least two first through holes, the sliding member has at least two second through holes, and each of the first fasteners passes through each of the first through holes and each of the second through holes in sequence to fasten the fixing member and the sliding member.

5. The crack detection device for pitch bearing according to claim 2, characterized in that: One of the two fixing members has a first protrusion, and the other has a first groove; One of the two sliding components has a second protrusion, and the other has a second groove; The first protrusion is inserted into the first groove to connect the two fixing members, and the second protrusion is inserted into the second groove to connect the two sliding components.

6. The crack detection device for a pitch bearing according to any one of claims 1 to 5, characterized in that: The two sliding mechanisms each have a seventh through hole on one side facing the bearing member, and the bearing member has two third protrusions, which are correspondingly inserted into the seventh through holes to connect the two sliding mechanisms.

7. The crack detection device for pitch bearing according to claim 6, characterized in that: The bearing member is provided with an eighth through hole, and the crack detection member is inserted into the eighth through hole.

8. The crack detection device for a pitch bearing according to any one of claims 1 to 5, characterized in that: There are multiple bearing members, and the multiple bearing members are connected between two sliding mechanisms at intervals.

9. The crack detection device for a pitch bearing according to any one of claims 1 to 5, characterized in that: It also includes at least two spaced-apart connecting mechanisms, each of which is used to connect one of the two fixing mechanisms to the hub of the wind turbine generator set.

10. A wind turbine generator set, characterized in that: include: dynamo; A coupling connected to the generator; a gear box connected to the coupling; A main shaft, the main shaft being connected to the gear box; a wheel hub, the wheel hub being connected to the main shaft; A pitch bearing, the pitch bearing being connected to the hub; a blade, wherein the blade is connected to the pitch bearing; The crack detection device applied to a pitch bearing as described in any one of claims 1 to 9, wherein the fixing mechanism of the crack detection device is sleeved on the circumferential side of the pitch bearing, and the crack detection member of the crack detection device is used to perform crack detection on the circumferential surface of the pitch bearing.

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