Reinforcing structure of variable pitch bearing

Abstract

The utility model discloses a reinforcing structure of a variable-pitch bearing, which relates to the technical field of wind power generation and comprises a plurality of reinforcing discs annularly spliced on an outer ring of the variable-pitch bearing. The lap joint plates are fixedly connected between every two adjacent reinforcing discs; the lap joint plate, the reinforcing disc and the outer ring are fixed through a plurality of first bolt pairs, and the reinforcing disc and the outer ring are fixed through a plurality of second bolt pairs. According to the utility model, an annular flange in the prior art is detached to form the four fan-shaped arc-shaped reinforcing discs, the four reinforcing discs can be mounted together with the outer ring of the variable-pitch bearing only by being hoisted to a high position, the blades and the variable-pitch bearing do not need to be detached, and the mounting is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind power generation technical field, concretely relates to a kind of reinforcing structure of variable pitch bearing. BACKGROUND

[0002] Variable pitch bearing is the rotating connecting component between wind turbine blade and hub, and is a key component in electric variable pitch system, is installed between blade and hub, and inner and outer rings are connected with blade and hub by bolt respectively, so that blade can rotate relative to its axis to achieve the purpose of variable pitch.

[0003] Due to the large weight of blade, variable pitch bearing is prone to cracking damage after long time work, in order to increase its service life, technicians improve the bearing, and add reinforcing flange to the bearing, but the diameter of reinforcing flange is large, and it is ring structure, so it needs to disassemble blade and bearing first during installation, which causes inconvenience in installation. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a kind of reinforcing structure of variable pitch bearing, to solve the technical problem of inconvenient installation of ring reinforcing flange with large diameter.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A kind of reinforcing structure of variable pitch bearing, comprising:

[0007] A plurality of reinforcing discs, a plurality of reinforcing discs are annularly spliced on the outer ring of variable pitch bearing;

[0008] A plurality of lap plates, the lap plate is lapped on the two adjacent reinforcing discs;

[0009] Wherein, the lap plate, the reinforcing disc and the outer ring are fixedly connected by a plurality of first bolt pairs, and the reinforcing disc and the outer ring are fixedly connected by a plurality of second bolt pairs.

[0010] Further, the first bolt pair comprises:

[0011] First double-headed studs are sequentially provided in the lap plate, the reinforcing disc and the outer ring;

[0012] A pair of gaskets are respectively sleeved on both ends of the first double-headed stud;

[0013] A pair of nuts are threadedly connected on both ends of the first double-headed stud, and the nut abuts on the corresponding gasket.

[0014] Further, the second bolt pair comprises:

[0015] The second double-ended stud passes through the reinforcing disc and the outer ring;

[0016] A pair of washers respectively fitted onto both ends of the second double-ended stud;

[0017] A pair of nuts are threaded onto both ends of the second double-ended stud, and the nuts abut against the corresponding washers.

[0018] Furthermore, the gasket is provided with several circular anti-slip protrusions arranged in a ring.

[0019] Furthermore, the pad is also provided with a number of circularly distributed arc-shaped anti-slip ridges, with the circular anti-slip ridges and the arc-shaped anti-slip ridges spaced apart.

[0020] Furthermore, the reinforcing disc has a plurality of first mounting holes, and the overlapping plate has a plurality of second mounting holes. The first bolt pair connects the overlapping plate, the reinforcing disc, and the outer ring, and the second bolt pair connects the first mounting holes and the outer ring.

[0021] Furthermore, each end of the reinforcing disc is provided with a convex arc and an arc-shaped groove, and the convex arc and the arc-shaped groove between two adjacent reinforcing discs are adapted to each other.

[0022] Furthermore, a limiting groove is formed on the convex arc, and a limiting protrusion is provided on the arc-shaped groove, the limiting protrusion being adapted to the limiting groove.

[0023] As can be seen from the above technical solution, the advantages of this utility model are:

[0024] 1. This utility model disassembles the existing ring flange into four fan-shaped arc-shaped reinforcing discs. These four reinforcing discs are spliced ​​together to form a ring structure. Compared with installing the entire flange, the four reinforcing discs only need to be hoisted to a high place to be installed with the outer ring of the pitch bearing. There is no need to disassemble the blades and the pitch bearing, which has the advantage of convenient installation.

[0025] 2. In this utility model, an overlap plate is provided between two adjacent reinforcing discs. The overlap plate can improve the connection strength between the two adjacent reinforcing discs, thereby making the installation of the pitch bearing more reliable.

[0026] 3. In this invention, the reinforcing disc and the pitch bearing, as well as the reinforcing disc, the pitch bearing, and the lap plate, are all connected by double-ended studs. Washers are provided at both ends of the double-ended studs, making the connection between the nut and the studs more secure. In addition, anti-slip components are provided on the washers, which enhance the anti-slip ability of the washers, thereby further improving the locking effect of the nut.

[0027] 4. In this utility model, a convex arc and an arc-shaped groove are respectively provided at both ends of the reinforcing disc. In this way, the ends of two adjacent reinforcing discs can be positioned and spliced ​​through the convex arc and the arc-shaped groove, thereby improving the accuracy of the reinforcing disc splicing and thus improving the connection accuracy with the outer ring of the pitch bearing. Attached Figure Description

[0028] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0029] Figure 1 This is a schematic diagram of the structure of the reinforcing disc of this utility model.

[0030] Figure 2 This is a perspective view of the reinforcing disc of this utility model.

[0031] Figure 3 for Figure 1 EE sectional view.

[0032] Figure 4 This is a schematic diagram of the installation of the reinforcing disc and the overlapping plate of this utility model.

[0033] Figure 5 for Figure 4 A schematic diagram of the split structure.

[0034] Figure 6 This is a structural schematic diagram of the lap joint plate of this utility model.

[0035] Figure 7 This is a schematic diagram of the structure of this utility model and its installation with the bearing.

[0036] Figure 8 for Figure 7 A magnified view of a portion at point F.

[0037] Figure 9 This is a partial sectional view of the present invention and its installation with the bearing.

[0038] Figure 10 This is a schematic diagram of the gasket structure of this utility model.

[0039] Figure 11 This is a schematic diagram of another embodiment of the reinforcing disc of this utility model.

[0040] Figure 12 for Figure 11 A three-dimensional image.

[0041] Figure 13 This is the workflow diagram for this application.

[0042] Figure 14 A schematic diagram showing the structure with recesses for circular anti-slip protrusions and indentations for arc-shaped anti-slip ridges.

[0043] Explanation of reference numerals in the attached drawings: 1-Reinforcing disc; 11-First mounting hole; 12-Convex arc; 13-Arc-shaped groove; 14-Limiting protrusion; 15-Limiting groove; 2-Overlapping plate; 21-Second mounting hole; 3-First double-ended stud; 4-Second double-ended stud; 5-Washer; 51-Circular anti-slip protrusion; 52-Arc-shaped anti-slip ridge; 6-Nut; 100-Pitch bearing; 101-Outer ring. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.

[0045] refer to Figures 1 to 14 ,like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, this embodiment provides a reinforcing structure for a pitch bearing, which consists of four arc-shaped reinforcing discs 1 (A, B, C, and D respectively), four arc-shaped overlapping plates 2, several first bolt pairs, and several second bolt pairs.

[0046] The reinforcing discs A, B, C, and D are completely identical in appearance. However, the four reinforcing discs A, B, C, and D installed on the same pitch bearing must have the same serial number, meaning they must be cut from the same ring. The four reinforcing discs A, B, C, and D with the same serial number must be located in the same packaging box.

[0047] Several reinforcing discs 1 can be spliced ​​together to form a hollow annular ring. This hollow annular ring is fixed to the outer ring 101 of the pitch bearing 100, enhancing the overall load-bearing capacity of the pitch bearing 100, thereby reducing cracking and extending its service life (the reinforcing discs are installed on the non-base surface of the outer ring of the pitch bearing). Four reinforcing discs 1 are sequentially fixed to the outer ring 101 using several second bolt pairs. Since the four reinforcing discs 1 are connected end-to-end, to improve the splicing reliability between adjacent reinforcing discs 1, an overlap plate 2 is provided between adjacent reinforcing discs 1. That is, the overlap plate 2, the reinforcing disc 1, and the outer ring 101 are fixed together using several second bolt pairs.

[0048] like Figure 7 , Figure 8 and Figure 9As shown, the first bolt assembly consists of a first double-ended stud 3, a pair of washers 5, and a pair of nuts 6. The reinforcing disc 1 has several first mounting holes 11 arranged in a ring, and the overlapping plate 2 has several second mounting holes 21 arranged in a ring, with the first and second mounting holes 11 corresponding to each other. The first double-ended stud 3 passes sequentially from top to bottom through the corresponding second mounting hole 21, the corresponding first mounting hole 11, and the corresponding through hole of the outer ring 101, with both ends of the first double-ended stud 3 protruding a certain distance from the end faces of the overlapping plate 2 and the outer ring 101. By fitting a pair of washers 5 onto both ends of the first double-ended stud 3 and locking them with the corresponding nuts 6, the overlapping plate 2, the reinforcing disc 1, and the outer ring 101 can be fixed together.

[0049] The second bolt assembly consists of a second double-ended stud 4, a pair of washers 5, and a pair of nuts 6. The second double-ended stud 4 passes between the first mounting hole 11 and the corresponding through hole of the outer ring 101, and both ends of the second double-ended stud 4 protrude a certain distance from the end faces of the reinforcing disc 1 and the outer ring 101. By fitting the pair of washers 5 onto both ends of the second double-ended stud 4 and locking them with the corresponding nuts 6, the reinforcing disc 1 and the outer ring 101 can be fixed together.

[0050] like Figure 10 As shown, when the nut 6 is tightened, it compresses the washer 5, causing the washer 5 to press against the reinforcing disc 1 / lap plate 2 / outer ring 101. To enhance the tightening effect, the washer 5 is provided with several annularly distributed circular anti-slip protrusions 51 and annularly distributed arc-shaped anti-slip ridges 52. The circular anti-slip protrusions 51 and arc-shaped anti-slip ridges 52 are spaced apart, which can increase the friction between the washer 5 and the reinforcing disc 1 / lap plate 2 / outer ring 101, making the connection between the first double-ended stud 3 / second double-ended stud 4 and the nut 6 more secure.

[0051] Gasket 5 is made of high-strength spring steel (such as 65Mn), such as Figure 14 As shown, in order to enhance friction and prevent loosening, several pits are provided on the upper surface of the circular anti-slip protrusion 51, and several indentations are provided on the upper surface of the arc-shaped anti-slip ridge 52.

[0052] As a second embodiment of this application, such as Figure 11 and Figure 12As shown, to improve the matching degree when two adjacent reinforcing discs 1 are spliced, this embodiment provides a convex arc 12 at one end of the reinforcing disc 1 and an arc-shaped groove 13 at the other end. When two reinforcing discs 1 are spliced, the convex arc 12 of one reinforcing disc 1 matches the arc-shaped groove 13 of the other reinforcing disc 1, ensuring accurate installation. Preferably, a limiting groove 15 is provided on the convex arc 12, and a limiting protrusion 14 is provided on the arc-shaped groove 13. The limiting protrusion 14 and the limiting groove 15 are adapted to each other, so that while the two adjacent reinforcing discs 1 are connected to the overlapping plate 2 by the first bolt pair, they can also be connected by the cooperation of the limiting protrusion 14 and the limiting groove 15, making the connection between the two adjacent reinforcing discs 1 more secure.

[0053] This application proposes improvements to the EN-2.3MW-110 wind turbine at the Daguashan-Xiaogoushan wind farm in Yunnan Province. Based on the model number, the number of first mounting holes 11 and through holes is now set to 64 each, and the number of second mounting holes 21 is set to 4. The specific operating procedure is as follows (e.g., ...). Figure 13 ):

[0054] Step S10, impeller positioning: Stop the fan, position one of the blades at +90° (i.e., the blade is vertically upward), and then lock the hub.

[0055] Step S20, Material hoisting: The reinforcing plate, hydraulic station, bolt assemblies and other tools are transported from the wind turbine foundation platform to the cable twisting platform by a small crane, and then the reinforcing plate, hydraulic station, bolt assemblies and other tools are transported from the wind turbine cable twisting platform to the yaw platform by a chain hoist.

[0056] Step S30, Through Hole Numbering: Starting from 270°, number the through holes of the outer ring 101 in a counter-clockwise direction (refer to...). Figure 7 Mark the positions of the through holes on the non-base surface of the pitch bearing with a marker: 270° on the blade root zero-degree mark corresponds to through hole #1, and mark the through holes in a counterclockwise direction.

[0057] Step S40, Install reinforcing discs and overlapping plates: Grind and remove rust from through holes, perform MT flaw detection, and install reinforcing discs A, B, C, and D and overlapping plates.

[0058] Install reinforcement disk A:

[0059] 4.1 Remove bolt sets. Remove the previously installed bolt sets 59#~64# and 1#~10# in sequence. Simultaneously remove the oil distributor bracket. The removed bolts, nuts, and washers should be neatly arranged so that they can be taken down with the fan after the work is completed.

[0060] 4.2. Evaluate the holes. For all holes, evaluate the condition according to the "Vision 2.1MW110 Installation Hole Corrosion Atlas". If the corrosion level inside the hole is ≤1, apply anti-rust oil directly to the hole; if the corrosion level inside the hole is >1, the hole needs to be plugged, ground, and then coated with anti-rust oil (MT testing is not required).

[0061] 4.3 Install the reinforcing disc. Ensuring the contact surface between the reinforcing disc 1 and the pitch bearing 100 is clean, install the reinforcing disc 1 (in order A) onto the through holes #61-64 and #1-8 using the second bolt pair, so that the second double-ended stud 4 protrudes 113±2mm from the end face of the pitch bearing 100. During installation, pay close attention to the orientation of the reinforcing disc; this can be identified by the stamped markings on the reinforcing disc, with the side bearing the stamped number facing outwards.

[0062] 4.4 Install and pre-tighten the bolt pairs. After installing the oil distributor bracket, apply molybdenum disulfide lubricant to the threaded mating surfaces of the second double-ended studs 4 (61-64# and 1#-8#). Then install the washers 5 and nuts 6, and pre-tighten the second bolt pairs (61-64#) to 50% of the tightening torque, and pre-tighten the second bolt pairs (1#-8#) to 100% of the tightening torque.

[0063] Install reinforcing plates B, C, and D and lap plates. Following steps 4.1 to 4.4, install the other three reinforcing plates 1 (i.e., B, C, and D) counterclockwise. Then install the four lap plates. Pre-tighten the first bolt pair to 100% torque.

[0064] Step S50, Nut Pre-tightening: After the four reinforcing discs 1 (A, B, C, D) and the lap plate are installed, perform final pre-tightening of all nuts 6 on the outer ring 101 with 100% pre-tightening force, apply thread anti-corrosion coating and mark anti-loosening lines.

[0065] Step S60, sealing the gap: Use a rubber tube to seal the gap between the blade roots of the two blades other than the operated blade and the fairing.

[0066] Step S70, Install reinforcing discs on the remaining blades: Install reinforcing disc 1 on the other two blades.

[0067] Step S80, Clean up the scene: Gather and take away the debris, tools, etc. from the scene.

[0068] Step S90, Quality Inspection: Complete the quality control plan and installation record acceptance form.

[0069] This application reinforces the pitch bearing 100 by splicing four reinforcing discs 1 together. There is no need to disassemble the pitch bearing 100 and the blades. The application can be reinforced and installed simply by hoisting it to a high place. It has the advantages of convenient operation, small installation space and short installation time.

[0070] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the embodiments of the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reinforcing structure for a pitch bearing, characterized in that, include: Several reinforcing discs (1) are annularly spliced ​​on the outer ring (101) of the pitch bearing (100); Several overlapping plates (2) overlap on two adjacent reinforcing discs (1); The overlapping plate (2), the reinforcing disc (1) and the outer ring (101) are fixedly connected by a number of first bolt pairs, and the reinforcing disc (1) and the outer ring (101) are fixedly connected by a number of second bolt pairs. The first bolt assembly includes: a first double-ended stud (3) through which the lap plate (2), the reinforcing disc (1) and the outer ring (101) are sequentially inserted; a pair of washers (5) respectively fitted on both ends of the first double-ended stud (3); and a pair of nuts (6) threadedly connected to both ends of the first double-ended stud (3), wherein the nuts (6) abut against the corresponding washers (5); The second bolt assembly includes: a second double-ended stud (4), which passes through the reinforcing disc (1) and the outer ring (101); a pair of washers (5) respectively fitted on both ends of the second double-ended stud (4); and a pair of nuts (6) threadedly connected to both ends of the second double-ended stud (4), which abut against the corresponding washers (5).

2. The reinforcing structure of the pitch bearing according to claim 1, characterized in that, The gasket (5) is provided with a number of circular anti-slip protrusions (51) distributed in a ring.

3. The reinforcing structure of the pitch bearing according to claim 2, characterized in that, The pad (5) is also provided with a number of circularly distributed arc-shaped anti-slip ridges (52), and the circular anti-slip ridges (51) and the arc-shaped anti-slip ridges (52) are spaced apart.

4. The reinforcing structure of the pitch bearing according to claim 1, characterized in that, The reinforcing disc (1) has a plurality of first mounting holes (11), and the overlapping plate (2) has a plurality of second mounting holes (21). The first bolt pair is connected between the overlapping plate (2), the reinforcing disc (1), and the outer ring (101), and the second bolt pair is connected between the first mounting holes (11) and the outer ring (101).

5. The reinforcing structure of the pitch bearing according to claim 1, characterized in that, The reinforcing disc (1) has a convex arc (12) and an arc-shaped groove (13) at both ends, and the convex arc (12) and the arc-shaped groove (13) between two adjacent reinforcing discs (1) are adapted to each other.

6. The reinforcing structure of the pitch bearing according to claim 5, characterized in that, A limiting groove (15) is provided on the convex arc (12), and a limiting protrusion (14) is provided on the arc-shaped groove (13). The limiting protrusion (14) is adapted to the limiting groove (15).

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