A propeller bearing cracking early warning device

Abstract

The present invention provides a variable pitch bearing crack warning device, comprising an annular track, wherein the annular track is movably arranged on the outer ring of the variable pitch bearing, the annular track is axially telescopically translated by a translation device, the annular track and the variable pitch bearing are arranged in concentric circles, the warning maintenance vehicle performs annular motion on the annular track by a driving device, the detection and cleaning ejector pin is movably pressed against the outer ring of the variable pitch bearing, the detection and cleaning ejector pin is connected with the anti-corrosion liquid tank through a flexible tube and a channel opened in the warning maintenance vehicle, the other end of the extrusion spring is fixedly mounted on the inner wall of the warning maintenance vehicle, the movable matching switch is movably matched with an upper contact switch or a lower contact switch, the present invention performs row-by-row abutment detection on the variable pitch bearing by the detection and cleaning ejector pin, and can also perform anti-corrosion maintenance on the variable pitch bearing during the monitoring process, effectively reducing the formation of oxygen, sulfur and chlorine corrosion in pitting pits, and effectively ensuring the safety of wind turbine blade operation.

Description

Technical Field

[0001] The invention relates to the technical field of bearing fracture detection devices, and in particular to a pitch bearing cracking early warning device. Background Art

[0002] Wind power generation is the most widely used and fastest-growing green energy technology in the world. In recent years, my country's wind power industry has developed rapidly, and the installed capacity of wind power has increased significantly. The number of mechanical failures of wind turbines has also increased accordingly. Rolling bearings are one of the most critical and important moving parts in wind turbines. They can be roughly divided into three categories: yaw bearings, pitch bearings and transmission system bearings. Among them, pitch bearings are mainly used in variable-pitch wind turbine generator sets above megawatt level. The blades of this generator set are installed on the hub. The pitch bearings and corresponding control devices adjust the windward angle of the blades according to the wind speed to obtain the best windward angle. Due to the complex stress conditions of wind power bearings, especially pitch bearings, the impact and vibration effects on the bearings are relatively large, and there are working conditions such as low-speed operation or swinging, condensed water or salt erosion, so cracking and failure problems are prone to occur;

[0003] Through analysis, it is found that the cracks of the variable pitch bearing usually spread from the bolt hole to the outside. There are multiple pitting pits on the surface near the bolt hole at the crack source, and microcracks initiated at the pitting pits, indicating that the fatigue cracks originate from the pitting pits. There are corrosion products in the pitting pits, and the content of oxygen, sulfur and chlorine in the corrosion products is high, indicating that the pitting pits are mainly formed by oxygen, sulfur and chlorine corrosion. Wind power equipment serves in a wide area and has a complex use environment. The humid air containing sulfides and chlorides causes local corrosion to the surface near the bolt holes, thus forming pitting pits; there is obvious stress concentration in the pitting pits. Under the action of large external forces, fatigue cracks initiate at the pitting pits, eventually leading to fatigue fracture. Once the variable pitch bearing breaks, serious operating accidents may occur;

[0004] However, the variable pitch bearings in the prior art do not have a crack warning mechanism after installation, and there is no regular anti-corrosion maintenance of the pitting pits after the bearings are installed. Therefore, the purpose of this application is to design a device that can perform regular maintenance on the variable pitch bearings in a timely manner and provide early warning of bearing cracks. Summary of the invention

[0005] The object of the present invention is to provide a pitch bearing crack warning device to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A pitch bearing crack warning device, comprising an annular track, the annular track is movably arranged on the outer ring of the pitch bearing, the annular track is axially telescopically translated by a translation device, the annular track and the pitch bearing are arranged in concentric circles, an early warning maintenance vehicle is movably arranged on the annular track, and the early warning maintenance vehicle performs circular motion on the annular track through a driving device;

[0008] The early warning maintenance vehicle is telescopically provided with a detection and cleaning ejector pin on one side close to the axis of the variable pitch bearing, the detection and cleaning ejector pin is movably pressed against the outer ring of the variable pitch bearing, and the extension line of the detection and cleaning ejector pin always passes through the axis of the variable pitch bearing;

[0009] The detection and cleaning ejector pin is a hollow structure, a spray disc is fixedly provided on the detection and cleaning ejector pin, the detection and cleaning ejector pin is connected with the spray hole on the spray disc through an internal channel, the detection and cleaning ejector pin is connected with the anti-corrosion liquid tank through a flexible tube and a channel opened in the early warning maintenance vehicle, the anti-corrosion liquid tank is connected with the pumping air mechanism, a movable matching switch is fixedly installed on the upper end of the detection and cleaning ejector pin, an extrusion spring is fixedly installed on the end of the movable matching switch away from the detection and cleaning ejector pin, and the other end of the extrusion spring is fixedly installed on the inner wall of the early warning maintenance vehicle, the movable matching switch is movably matched with the upper contact switch or the lower contact switch, the upper contact switch and the driving device are in the same passage, and the lower contact switch and the alarm device are in the same passage.

[0010] Preferably, the translation device comprises an electric hydraulic telescopic cylinder, the electric hydraulic telescopic cylinder is fixedly installed inside the fan cover, and the telescopic arm of the electric hydraulic telescopic cylinder is fixedly installed on the side of the circular track.

[0011] Preferably, the driving device includes a driving motor, which is fixedly installed on one side of the early warning maintenance vehicle. A driving rubber wheel is fixedly installed on the driving shaft of the driving motor, and the driving rubber wheel is movably matched with the outer ring of the circular track. The early warning maintenance vehicle is also movably installed with a pair of matching rubber wheels, and the matching rubber wheels movably abut against the inner ring of the circular track.

[0012] Preferably, the air pumping mechanism includes a telescopic cylinder, a telescopic piston is movably arranged in the telescopic cylinder, the telescopic piston is connected to the telescopic double-sided rack through a connecting rod, the telescopic double-sided rack is meshed with an irregular gear, the irregular gear is fixedly mounted on the driving shaft of the driving motor, a one-way air inlet valve is installed on the telescopic piston, and a one-way air outlet valve is fixedly mounted on the end of the telescopic cylinder away from the irregular gear.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention performs abutment detection on the variable pitch bearing by using a detection and cleaning ejector pin. When cracks appear on the surface of the variable pitch bearing, the slender detection and cleaning ejector pin is pushed into the cracked part by the extrusion spring, thereby triggering the alarm mechanism to work and promptly reminding the staff to replace it;

[0015] 2. The present invention can not only detect cracking, but also perform anti-corrosion maintenance on the variable pitch bearing during the monitoring process, effectively reducing the formation of oxygen, sulfur and chlorine corrosion in pitting pits, and further preventing the cracking of the variable pitch bearing;

[0016] 3. The present invention can perform comprehensive inspection on all parts of the outer ring of the variable pitch bearing. Since it was limited to the outer ring around the threaded hole in the early stage, if the outer ring of the variable pitch bearing cannot be inspected line by line, early cracks may not be found. Through this detection method, cracks can be discovered in time at the early stage of crack formation, ensuring the safe operation of the wind turbine blades.

[0017] The present invention performs row-by-row abutment detection on the variable pitch bearing by detecting and cleaning the ejector pin, and can also perform anti-corrosion maintenance on the variable pitch bearing during the monitoring process, effectively reducing the formation of oxygen, sulfur and chlorine corrosion in pitting pits, and effectively ensuring the safe operation of the fan blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the position of the annular track relative to the pitch bearing of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 3 It is a cross-sectional schematic diagram of the internal structure of the early warning maintenance vehicle of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the driving rubber wheel and the matching rubber wheel of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the spray plate of the present invention;

[0023] Figure 6 It is a simplified circuit diagram of the present invention.

[0024] In the figure: 1 annular track, 2 pitch bearing, 3 early warning maintenance vehicle, 4 detection and cleaning ejector pin, 5 flexible pipe, 6 anti-corrosion liquid tank, 7, alarm device, 8 movable matching switch, 9 extrusion spring, 10 upper contact switch, 11 lower contact switch, 12 electric hydraulic telescopic cylinder, 13 driving motor, 14 driving rubber wheel, 15 matching rubber wheel, 16 telescopic cylinder, 17 telescopic piston, 18 telescopic double-sided rack, 19 irregular gear, 20 one-way air inlet valve, 21 one-way air outlet valve, 22 spray plate, 23 spray hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example:

[0027] See also Figure 1-6 , the present invention provides a technical solution:

[0028] A pitch bearing crack warning device comprises an annular track 1, the annular track 1 is movably arranged on the outer ring of the pitch bearing 2, the annular track 1 is axially telescopically translated by a translation device, the annular track 1 and the pitch bearing 2 are arranged in concentric circles, an early warning maintenance vehicle 3 is movably arranged on the annular track 1, and the early warning maintenance vehicle 3 performs circular motion on the annular track 1 through a driving device;

[0029] The early warning maintenance vehicle 3 performs circular motion on the circular track 1, thereby detecting cracks at various positions of the variable pitch bearing 2. Through the axial translation motion of the circular track 1, the early warning maintenance vehicle 3 can check each position of the outer ring of the variable pitch bearing 2 line by line, thereby improving the accuracy of early warning of cracks;

[0030] A detection and cleaning ejector pin 4 is telescopically arranged on one side of the early warning maintenance vehicle 3 close to the axis of the variable pitch bearing 2. The detection and cleaning ejector pin 4 is movable against the outer ring of the variable pitch bearing 2, and the extension line of the detection and cleaning ejector pin 4 always passes through the axis of the variable pitch bearing 2.

[0031] The detection cleaning ejector pin 4 moves perpendicularly to the outer ring surface of the pitch bearing 2. By detecting that the cleaning ejector pin 4 abuts against the surface of the pitch bearing 2, it is determined whether the outer ring of the pitch bearing 2 is cracked. When cracks appear in the pitch bearing 2, the detection cleaning ejector pin 4 enters the crack under the action of the extrusion spring 9, thereby triggering the alarm device 7 to send an alarm signal remotely, prompting maintenance personnel to come for inspection;

[0032] The detection and cleaning ejector pin 4 is a hollow structure, on which a spray disc 22 is fixedly arranged, and the detection and cleaning ejector pin 4 is connected with a spray hole 23 on the spray disc 22 through an internal channel, and the detection and cleaning ejector pin 4 is connected with an anti-corrosion liquid tank 6 through a flexible tube 5 and a channel opened in the early warning maintenance vehicle 3, and the anti-corrosion liquid tank 6 is connected with a pumping mechanism, and a movable cooperation switch 8 is fixedly installed on the upper end of the detection and cleaning ejector pin 4, and an extrusion spring 9 is fixedly installed at one end of the movable cooperation switch 8 away from the detection and cleaning ejector pin 4, and the other end of the extrusion spring 9 is fixedly installed on the inner wall of the early warning maintenance vehicle 3, and the movable cooperation switch 8 is movably cooperated with the upper contact switch 10 or the lower contact switch 11, and the upper contact switch 10 and the driving device are in the same passage, and the lower contact switch 11 and the alarm device 7 are in the same passage.

[0033] When the variable pitch bearing 2 is in normal operation, the MCU in the early warning maintenance vehicle 3 controls the detection and cleaning ejector pin 4 to work at a fixed time. At this time, the movable matching switch 8 contacts the upper contact switch 10. Since the upper contact switch 10 and the driving device are in the same passage, when the driving device is in the passage state, the driving device works normally to ensure that the early warning maintenance vehicle 3 makes a circular motion on the circular track 1. During this process, the pumping mechanism works so that the anti-corrosion liquid in the anti-corrosion liquid tank 6 acts on the surface of the variable pitch bearing 2 and the surrounding of the threaded holes on the side, so as to perform anti-corrosion maintenance in a non-cracked state. When cracks appear on the surface of the variable pitch bearing 2, the detection and cleaning ejector pin 4 enters the crack under the action of the extrusion spring 9. At this time, the movable matching switch 8 turns on the passage where the alarm device 7 is located. Synchronously, the driving device stops working. At this time, the early warning maintenance vehicle 3 stops the circular motion. This setting is convenient for maintenance personnel to quickly find the crack position after arriving. The alarm device 7 in this embodiment is connected to the monitoring room for communication. The alarm device 7 sends a fault signal to the monitoring room to remind the staff to come for inspection.

[0034] As a preferred embodiment, the translation device includes an electric hydraulic telescopic cylinder 12, which is fixedly installed inside the fan cover. The telescopic arm of the electric hydraulic telescopic cylinder 12 is fixedly installed on the side of the circular track 1. The movement of the electric hydraulic telescopic cylinder 12 drives the circular track 1 to perform axial telescopic and translation, thereby ensuring that the early warning maintenance vehicle 3 can detect various positions of the variable pitch bearing 2.

[0035] As a preferred embodiment, the driving device includes a driving motor 13, which is fixedly installed on one side of the early warning maintenance vehicle 3. A driving rubber wheel 14 is fixedly installed on the driving shaft of the driving motor 13, and the driving rubber wheel 14 is movably matched with the outer ring of the circular track 1. A pair of matching rubber wheels 15 are also movably installed on the early warning maintenance vehicle 3, and the matching rubber wheels 15 are movably abutted against the inner ring of the circular track 1. This arrangement ensures that the matching rubber wheels 15 and the driving rubber wheels 14 confine the early warning maintenance vehicle 3 within the circular track 1.

[0036] As a preferred embodiment, the air pumping mechanism includes a telescopic cylinder 16, in which a telescopic piston 17 is movably arranged, the telescopic piston 17 is connected to a telescopic double-sided rack 18 through a connecting rod, the telescopic double-sided rack 18 is meshed with an irregular gear 19, the irregular gear 19 is fixedly mounted on the driving shaft of the driving motor 13, a one-way air inlet valve 20 is mounted on the telescopic piston 17, and a one-way air outlet valve 21 is fixedly mounted on one end of the telescopic cylinder 16 away from the irregular gear 19. Through the setting of this air pumping mechanism, it is ensured that the anti-rust liquid is sprayed while the driving motor 13 is working, and the spraying of the anti-rust liquid is stopped synchronously when the driving motor 13 stops working, thereby ensuring the uniformity of the anti-rust liquid spraying and reducing the use of electrical components.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pitch bearing crack warning device, comprising a ring track (1), characterized in that: The annular track (1) is movably arranged on the outer ring of the variable pitch bearing (2); the annular track (1) is axially telescopically translated by a translation device; the annular track (1) and the variable pitch bearing (2) are arranged concentrically; an early warning maintenance vehicle (3) is movably arranged on the annular track (1); the early warning maintenance vehicle (3) performs an annular motion on the annular track (1) by a driving device; The early warning maintenance vehicle (3) is telescopically provided with a detection and cleaning ejector pin (4) near the axis of the variable pitch bearing (2); the detection and cleaning ejector pin (4) is movably pressed against the outer ring of the variable pitch bearing (2); and the extension line of the detection and cleaning ejector pin (4) always passes through the axis of the variable pitch bearing (2); The detection and cleaning ejector pin (4) is a hollow structure. A spray plate (22) is fixedly arranged on the detection and cleaning ejector pin (4). The detection and cleaning ejector pin (4) is connected to the spray hole (23) on the spray plate (22) through an internal channel. The detection and cleaning ejector pin (4) is connected to the anti-corrosion liquid tank (6) through a flexible tube (5) and a channel opened in the early warning maintenance vehicle (3). The anti-corrosion liquid tank (6) is connected to the pumping mechanism. A movable matching switch (8) is fixedly installed on the detection and cleaning ejector pin (4). An extrusion spring (9) is fixedly installed at one end of the movable matching switch (8) away from the detection and cleaning ejector pin (4). The other end of the extrusion spring (9) is fixedly installed on the inner wall of the early warning maintenance vehicle (3). The movable matching switch (8) is movably matched with an upper contact switch (10) or a lower contact switch (11). The upper contact switch (10) and the driving device are in the same passage. The lower contact switch (11) and the alarm device (7) are in the same passage. The translation device comprises an electric hydraulic telescopic cylinder (12), the electric hydraulic telescopic cylinder (12) is fixedly mounted inside the fan cover, and the telescopic arm of the electric hydraulic telescopic cylinder (12) is fixedly mounted on the side of the circular track (1); The driving device comprises a driving motor (13), the driving motor (13) being fixedly mounted on one side of the early warning maintenance vehicle (3), a driving rubber wheel (14) being fixedly mounted on a driving shaft of the driving motor (13), the driving rubber wheel (14) being movably matched with an outer ring of the annular track (1), and a pair of matching rubber wheels (15) being movably mounted on the early warning maintenance vehicle (3), the matching rubber wheels (15) being movably pressed against an inner ring of the annular track (1).

2. A pitch bearing crack warning device according to claim 1, characterized in that: The air pump mechanism comprises a telescopic cylinder (16), a telescopic piston (17) is movably arranged in the telescopic cylinder (16), the telescopic piston (17) is connected to a telescopic double-sided rack (18) through a connecting rod, the telescopic double-sided rack (18) is meshed with an irregular gear (19), the irregular gear (19) is fixedly mounted on the driving shaft of the driving motor (13), a one-way air inlet valve (20) is mounted on the telescopic piston (17), and a one-way air outlet valve (21) is fixedly mounted on one end of the telescopic cylinder (16) away from the irregular gear (19).

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