Wind turbine bearing preload device and preload method

Abstract

The present invention relates to the field of wind power generation technology, and provides a wind turbine bearing preload device and preload method. The wind turbine bearing preload device includes: a stress collector, which is arranged between the bearing seat and the end face of the bearing, and is used to detect the first preload force borne by the bearing in real time during the preload process of the bearing; a preload sleeve, which is movably mounted on the main shaft where the bearing is located, and is used to apply a second preload force to the bearing; a preload mechanism is used to adjust the second preload force applied to the bearing by the preload sleeve according to the first preload force collected by the stress collector, thereby ensuring that the first preload force borne by the bearing remains within an appropriate range, avoiding affecting the service life of the bearing due to excessive first preload force or causing bearing failure due to excessive first preload force. The wind turbine bearing preload device and wind turbine bearing preload method provided by the present application are simple and easy to implement in controlling the bearing preload force, and solve the problem of complex bearing preload force adjustment in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind turbine bearing pre-tightening device and a wind turbine bearing pre-tightening method. Background Art

[0002] As a key component of wind turbines, main shaft bearings are subjected to high dynamic loads and complex working environments. If the main bearings fail, it will cause significant production losses.

[0003] Commonly used semi-direct drive wind turbines generally use a bearing arrangement with double tapered roller bearings. This bearing design has high reliability and long service life, but the bearing preload must be controlled as accurately as possible during the assembly phase. Too little preload will cause premature bearing failure. Currently, in engineering projects, it is necessary to calculate the bearing preload according to the finite element method, and then adjust the gasket for grinding or selection. The entire preload process is relatively complicated and is also affected by factors such as calculation, component temperature, measurement error, and processing error. In addition, the traditional installation method of the main shaft bearing is to install the preload in the vertical state of the shaft system. During vertical installation, the weight of the components will affect the preload, and the actual tooling state of the main shaft bearing is that the shaft system is placed horizontally. Therefore, it is necessary to provide a simpler preload adjustment device or method to solve at least one of the above problems. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a wind turbine bearing pre-tightening device and a wind turbine bearing pre-tightening method, which are used to solve the problem of complex bearing pre-tightening force adjustment in the prior art.

[0005] In order to achieve the above-mentioned object, the present invention provides a wind turbine bearing pre-tightening device, which includes:

[0006] A stress collector is provided between the bearing seat and the end face of the bearing, and is used to detect the first preload force borne by the bearing in real time during the process of preloading the bearing;

[0007] A preload sleeve, movably mounted on the main shaft where the bearing is located, for applying a second preload force to the bearing;

[0008] A preload mechanism is electrically connected to the stress collector and detachably connected to the preload sleeve; the preload mechanism is used to adjust a second preload force applied by the preload sleeve to the bearing according to the first preload force collected by the stress collector.

[0009] Specifically, the pre-tightening sleeve is threadedly sleeved on the main shaft.

[0010] Specifically, an adjustment blind hole is provided on the pre-tightening sleeve, a thread screwed to the main shaft is provided in the adjustment blind hole, and a plurality of adjustment grooves are provided on the surface of the pre-tightening sleeve facing away from the bottom of the adjustment blind hole. The pre-tightening mechanism is detachably connected to the pre-tightening sleeve through the plurality of adjustment grooves.

[0011] Specifically, the wind turbine bearing pre-tightening device further includes an elastic member, which is arranged at the bottom of the adjusting blind hole.

[0012] Specifically, a plurality of adjusting grooves are arranged along the circumference of the adjusting blind hole.

[0013] Specifically, the pre-tightening mechanism includes: a pre-tightening driver and a pre-tightening claw;

[0014] The pre-tightening claw includes an annular claw sleeve and a claw rod corresponding to the adjustment blind hole one by one;

[0015] The annular claw sleeve is connected to the drive shaft of the preload driver;

[0016] The claw rods are evenly distributed along the circumference of the annular claw sleeve. When the pre-tightening mechanism is connected to the pre-tightening sleeve, each claw rod can extend into the corresponding adjustment groove.

[0017] The preload driver is electrically connected to the stress collector and is used to drive the preload claw to rotate according to the first preload force collected by the stress collector to adjust the second preload force applied by the preload sleeve to the bearing.

[0018] Specifically, each claw rod is detachably arranged on the annular claw sleeve.

[0019] Specifically, the wind turbine bearing preload device further includes: a telescopic driver and a positioner;

[0020] The positioner has a positioner body and a sensing head, the sensing head is arranged on the pre-tightening sleeve, the positioner body is arranged on the pre-tightening claw and is electrically connected to the telescopic driver, the positioner body sends a proximity signal according to the proximity position of the sensing head, and the telescopic driver is used to drive the claw rod of the pre-tightening claw to extend into the corresponding adjustment groove according to the proximity signal.

[0021] Specifically, the wind turbine bearing preload device further includes: an alarm device electrically connected to the stress collector, configured to issue a corresponding alarm prompt according to the first preload force collected by the stress collector.

[0022] Another aspect of the present invention provides a wind turbine bearing pre-tightening method, which uses any of the above-mentioned wind turbine bearing pre-tightening devices to perform bearing pre-tightening. The wind turbine bearing pre-tightening method includes:

[0023] During the pre-tightening process of the bearing, the first pre-tightening force borne by the bearing is detected in real time by a stress collector;

[0024] The preload mechanism adjusts the second preload force applied by the preload sleeve to the bearing according to the first preload force collected by the stress collector.

[0025] The wind turbine bearing preload device provided by the present invention is provided with a stress collector between the bearing seat and the end face of the bearing, so that the stress collector can detect in real time the first preload force borne by the bearing when preloading the bearing. The preload mechanism adjusts the magnitude of the second preload force applied to the bearing by the preload sleeve according to the first preload force collected by the stress collector, thereby ensuring that the first preload force borne by the bearing is ultimately maintained within an appropriate range, avoiding affecting the service life of the bearing due to excessive first preload force or causing bearing failure due to excessive first preload force. The wind turbine bearing preload device and wind turbine bearing preload method provided by the present application make it simple and easy to adjust the bearing preload force, thereby solving the problem of complex bearing preload force adjustment in the prior art.

[0026] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0028] Figure 1 It is a structural schematic diagram of the wind turbine bearing pre-tightening device provided by the present invention;

[0029] Figure 2 A three-dimensional schematic diagram of a pre-tightening sleeve and a pre-tightening structure in a wind turbine bearing pre-tightening device provided by the present invention;

[0030] Figure 3 A cross-sectional view of a pretightening sleeve and a pretightening structure in a wind turbine bearing pretightening device provided by the present invention.

[0031] Description of Reference Numerals

[0032] 1-stress collector; 2-bearing seat; 3-bearing; 4-preload sleeve; 5-spindle; 6-preload mechanism; 8-elastic part; 9-storage table; 41-adjustment blind hole; 42-adjustment groove; 61-preload claw; 62-preload driver; 611-annular claw sleeve; 612-claw rod; 71-telescopic driver; 72-locator; 721-locator body; 722-sensor head. DETAILED DESCRIPTION

[0033] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0034] Figure 1 This is a structural diagram of the wind turbine bearing preload device. Figure 2 It is a three-dimensional schematic diagram of the preload sleeve and preload structure in the wind turbine bearing preload device. Figure 3 This is a cross-sectional view of the preload sleeve and preload structure in the wind turbine bearing preload device, such as Figure 1-Figure 3 As shown, the present invention provides a wind turbine bearing pre-tightening device on one hand, and the wind turbine bearing pre-tightening device includes:

[0035] The stress collector 1 is provided between the bearing seat 2 and the end face of the bearing 3, and is used to detect the first preload force borne by the bearing 3 in real time during the preload process of the bearing 3;

[0036] A preload sleeve 4 is movably mounted on the main shaft 5 where the bearing 3 is located, and is used to apply a second preload force to the bearing 3;

[0037] The preload mechanism 6 is electrically connected to the stress collector 1 and is detachably connected to the preload sleeve 4 ; the preload mechanism 6 is used to adjust the second preload force applied to the bearing 3 by the preload sleeve 4 according to the first preload force collected by the stress collector 1 .

[0038] The wind turbine bearing preload device provided by the present invention detects the first preload force borne by the bearing 3 in real time by arranging a stress collector 1 between the end face of the bearing 3 and the bearing seat 2. The first preload force is the preload force actually borne by the bearing 3. The preload sleeve 4 is movably mounted on the main shaft 5 to apply a second preload force to the bearing 3. The preload mechanism 6 adjusts the magnitude of the second preload force applied by the preload sleeve 4 to the bearing according to the first preload force collected by the stress collector 1, thereby ensuring that the first preload force borne by the bearing 3 is always within an appropriate range, avoiding the bearing 3 from burning out or having a short service life due to excessive first preload force, or avoiding the bearing 3 from failing due to excessive first preload force. The wind turbine bearing preload device provided by the present invention has a simple structure, is convenient for accurately adjusting the magnitude of the second preload force applied to the bearing 3, simplifies the bearing preload force adjustment method, and solves the problem of complex bearing preload force adjustment in the prior art.

[0039] In one embodiment, the preload sleeve 4 is threadedly mounted on the spindle 5. The preload sleeve 4 is provided with an adjustment blind hole 41, which is threaded with the spindle 5. A plurality of adjustment grooves 42 are provided on the surface of the preload sleeve 4 facing away from the bottom of the adjustment blind hole 41. The preload mechanism 6 is detachably connected to the preload sleeve 4 via the plurality of adjustment grooves 42. The plurality of adjustment grooves 42 are arranged along the circumference of the adjustment blind hole 41. A trapezoidal external thread is provided on the spindle 5, and an internal thread that mates with the trapezoidal external thread is provided in the adjustment blind hole 41 of the preload sleeve 4. The preload sleeve 4 is threadedly mounted on the spindle 5. The magnitude of the second preload force applied by the preload sleeve 4 to the bearing 3 can be controlled by rotating the preload sleeve 4. To control the magnitude of the second preload force applied by the preload sleeve 4 to the bearing 3 via the preload mechanism 6, the preload sleeve 4 is provided with adjustment grooves 42. These adjustment grooves 42 facilitate connection of the preload mechanism 6 to the preload sleeve 4 via the adjustment grooves 42 to control the rotation of the preload sleeve 4.

[0040] The preload sleeve 4 is threadedly connected to the main shaft 5. In order to prevent the preload sleeve 4 from loosening due to the thread gap between the threaded connections when the preload sleeve 4 applies the second preload force to the bearing 3, the wind turbine bearing preload device also includes an elastic member 8, which is arranged at the bottom of the adjustment blind hole 41. The elastic member 8 is arranged at the bottom of the adjustment blind hole 41. The elastic member 8 can be an elastic washer or a spring. In this way, when the preload sleeve 4 applies the second preload force to the bearing 3, the elastic force generated between the elastic member 8 and the end face of the main shaft 5 can eliminate the gap between the preload sleeve 4 and the main shaft 5, thereby preventing the preload sleeve 4 from loosening.

[0041] In order to facilitate the control of the rotation of the pre-tightening sleeve 4, the pre-tightening mechanism 6 includes: a pre-tightening driver 62 and a pre-tightening claw 61;

[0042] The pre-tightening claw 61 includes an annular claw sleeve 611 and a claw rod 612 corresponding to the adjustment blind hole 41;

[0043] The annular claw sleeve 611 is connected to the drive shaft of the preload driver 62;

[0044] The claw rods 612 are evenly distributed along the circumference of the annular claw sleeve 611. When the pre-tightening mechanism 6 is connected to the pre-tightening sleeve 4, each claw rod 612 can extend into the corresponding adjustment groove 42.

[0045] The preload driver 62 is electrically connected to the stress collector 1 and is used to drive the preload claw 61 to rotate according to the first preload force collected by the stress collector 1 to adjust the second preload force applied by the preload sleeve 4 to the bearing 3.

[0046] The claw rod 612 of the pre-tightening claw 61 of the pre-tightening mechanism 6 extends into the corresponding adjustment groove 42, and the annular claw sleeve 611 installed on its main shaft is driven to rotate by the pre-tightening driver 62, thereby driving the claw rod 612 and the pre-tightening sleeve 4 to rotate, so that the second pre-tightening force applied by the pre-tightening sleeve 4 to the bearing 3 is adjusted. The pre-tightening driver 62 is a hydraulic motor or an electric motor. The pre-tightening driver 62 drives the pre-tightening sleeve 4 to rotate according to the first pre-tightening force detected by the stress collector 1 and the bearing 3, thereby adjusting the first pre-tightening force applied by the pre-tightening sleeve 4 to the bearing 3, so that the first pre-tightening force actually borne by the bearing 3 is always in a suitable range.

[0047] To ensure that the claw rods 612 can match adjustment grooves 42 of different sizes, each claw rod 612 is detachably mounted on the annular claw sleeve 611. For example, each claw rod 612 is threaded onto the end surface of the annular claw sleeve 611 facing the preload sleeve 4. Adjustment grooves 42 of different sizes can be easily connected to the preload mechanism 6 and the preload sleeve 4 by replacing the claw rods 612 of the corresponding size.

[0048] In order to facilitate the claw rod 612 to quickly extend into the corresponding adjustment groove 42 to complete the connection between the preload mechanism 6 and the preload sleeve 4, the wind turbine bearing preload device further includes: a telescopic driver 71 and a positioner 72;

[0049] The positioner 72 includes a positioner body 721 and a sensing head 722. The sensing head 722 is disposed on the pre-tightening sleeve 4. The positioner body 721 is disposed on the pre-tightening claw 61 and is electrically connected to the telescopic driver 71. The positioner body 721 sends a proximity signal based on the proximity position of the sensing head 722 to drive the claw rod 612 of the pre-tightening claw 61 to extend into the corresponding adjustment groove 42. When the claw rod 612 is extended into the corresponding adjustment groove 42, the pre-tightening driver 62 drives the pre-tightening claw 61 to rotate. The positioner body 721, which is mounted on the annular claw sleeve 611 of the pre-tightening claw 61, rotates along with the pre-tightening claw sleeve 612. When the positioner body 721 approaches the sensing head 722 disposed on the pre-tightening sleeve 4, the positioner body 721 sends a proximity signal to the telescopic driver 71. After receiving the proximity signal, the telescopic driver 71 drives the claw rod 612 of the pre-tightening claw 61 to extend into the corresponding adjustment groove 42, completing the connection between the pre-tightening mechanism 6 and the pre-tightening sleeve 4.

[0050] In one embodiment, Figure 3As shown, the pre-tightening driver 62 is slidably set on the storage platform 9, the driving shaft of the pre-tightening driver 62 is set toward the pre-tightening sleeve 4, the telescopic driver 71 is fixedly installed on the storage platform 9, and the telescopic driver 71 is connected to the pre-tightening driver 62. After receiving the approach signal, the telescopic driver 71 drives the pre-tightening driver 62 to move, thereby driving the claw rod 612 of the pre-tightening claw 61 installed on the driving shaft of the pre-tightening driver 62 to extend into the corresponding adjustment groove 42.

[0051] In order to facilitate the staff to intuitively know the magnitude of the first preload force borne by the bearing 3, the wind turbine bearing preload device further includes: an alarm device, which is electrically connected to the stress collector 1 and is used to issue a corresponding alarm prompt according to the first preload force collected by the stress collector 1. For example, the alarm device is an audible and visual alarm alarm device, and the corresponding alarm prompt information is pre-set in the alarm device. For example, when it is detected that the first preload force borne by the bearing 3 is greater than the predetermined preload force, the alarm device is set to emit a red warning light and play a corresponding warning sound. When it is detected that the first preload force borne by the bearing 3 is less than the predetermined preload force, the alarm device is set to emit a blue warning light and play another warning sound. In this way, the staff can know the magnitude of the first preload force currently borne by the bearing 3 according to the alarm prompt of the alarm device, which is convenient for the staff to verify whether the preload mechanism 6 is working correctly.

[0052] Another aspect of the present invention provides a wind turbine bearing pre-tightening method, which uses any of the above-mentioned wind turbine bearing pre-tightening devices to perform bearing pre-tightening. The wind turbine bearing pre-tightening method includes:

[0053] During the pre-tightening process of the bearing 3, the first pre-tightening force borne by the bearing 3 is detected in real time by the stress collector 1;

[0054] The preload mechanism 6 adjusts the second preload force applied by the preload sleeve 4 to the bearing 3 according to the first preload force collected by the stress collector 1 .

[0055] The wind turbine bearing preload device provided by the present invention is provided with a stress collector between the bearing seat and the end face of the bearing, so that the stress collector can detect in real time the first preload force borne by the bearing when preloading the bearing. The preload mechanism adjusts the magnitude of the second preload force applied to the bearing by the preload sleeve according to the first preload force collected by the stress collector, thereby ensuring that the first preload force borne by the bearing is ultimately maintained within an appropriate range, avoiding affecting the service life of the bearing due to excessive first preload force or causing bearing failure due to excessive first preload force. The wind turbine bearing preload device and wind turbine bearing preload method provided by the present application make it simple and easy to adjust the bearing preload force, thereby solving the problem of complex bearing preload force adjustment in the prior art.

[0056] The above describes in detail the optional implementation methods of the embodiments of the present invention in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation methods. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the scope of protection of the embodiments of the present invention.

[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0058] Those skilled in the art will understand that all or part of the steps in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a program, which is stored in a storage medium and includes a number of instructions for causing a single-chip microcomputer, chip or processor to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program code.

[0059] In addition, various implementations of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A wind turbine bearing preload device, characterized in that: The wind turbine bearing preload device comprises: A stress collector (1) is arranged between the bearing seat (2) and the end face of the bearing (3), and is used to detect in real time the first preload force borne by the bearing (3) during the process of preloading the bearing (3); A preload sleeve (4) is movably mounted on the main shaft (5) where the bearing (3) is located, and is used to apply a second preload force to the bearing (3); A pre-tightening mechanism (6) is electrically connected to the stress collector (1) and detachably connected to the pre-tightening sleeve (4); the pre-tightening mechanism (6) is used to adjust a second pre-tightening force applied by the pre-tightening sleeve (4) to the bearing (3) according to a first pre-tightening force collected by the stress collector (1), wherein the pre-tightening mechanism (6) comprises: a pre-tightening driver (62) and a pre-tightening claw (61); The pre-tightening claw (61) comprises an annular claw sleeve (611) and a plurality of claw rods (612); The annular claw sleeve (611) is connected to the drive shaft of the preload driver (62); A plurality of claw rods (612) are evenly distributed along the circumference of the annular claw sleeve (611), and when the pre-tightening mechanism (6) is connected to the pre-tightening sleeve (4), each claw rod (612) can extend into the corresponding adjustment groove (42); The preload driver (62) is electrically connected to the stress collector (1) and is used to drive the preload claw (61) to rotate according to the first preload force collected by the stress collector (1) to adjust the second preload force applied by the preload sleeve (4) to the bearing (3).

2. The wind turbine bearing preload device according to claim 1, characterized in that: The pre-tightening sleeve (4) is threadedly sleeved on the main shaft (5).

3. The wind turbine bearing preload device according to claim 2, characterized in that: The pre-tightening sleeve (4) is provided with an adjustment blind hole (41), a thread for being screwed to the main shaft (5) is provided in the adjustment blind hole (41), a plurality of adjustment grooves (42) are provided on a surface of the pre-tightening sleeve (4) facing away from the bottom of the adjustment blind hole (41), and the pre-tightening mechanism (6) is detachably connected to the pre-tightening sleeve (4) via the plurality of adjustment grooves (42).

4. The wind turbine bearing preload device according to claim 3, characterized in that: The wind turbine bearing pre-tightening device further comprises an elastic member (8), and the elastic member (8) is arranged at the bottom of the adjusting blind hole (41).

5. The wind turbine bearing preload device according to claim 3, characterized in that: A plurality of adjustment grooves (42) are arranged along the circumference of the adjustment blind hole (41).

6. The wind turbine bearing preload device according to claim 5, characterized in that: The adjustment blind holes (41) correspond to the claw rods (612) one by one.

7. The wind turbine bearing preload device according to claim 1, characterized in that: Each claw rod (612) is detachably arranged on the annular claw sleeve (611).

8. The wind turbine bearing preload device according to claim 1, characterized in that: The wind turbine bearing pre-tightening device further comprises: a telescopic driver (71) and a positioner (72); The positioner (72) comprises a positioner body (721) and a sensing head (722), wherein the sensing head (722) is arranged on the pre-tightening sleeve (4), the positioner body (721) is arranged on the pre-tightening claw (61) and is electrically connected to the telescopic driver (71), the positioner body (721) sends a proximity signal according to the proximity position of the sensing head (722), and the telescopic driver (71) is used to drive the claw rod (612) of the pre-tightening claw (61) to extend into the corresponding adjustment groove (42) according to the proximity signal.

9. The wind turbine bearing preload device according to claim 1, characterized in that: The wind turbine bearing pre-tightening device further comprises: an alarm device electrically connected to the stress collector (1) and configured to issue a corresponding alarm prompt based on the first pre-tightening force collected by the stress collector (1).

10. A method for pre-tightening a bearing of a wind turbine generator set, comprising: using the wind turbine generator set bearing pre-tightening device according to any one of claims 1 to 9 to perform bearing pre-tightening, characterized in that: The wind turbine bearing pre-tightening method comprises: During the process of pre-tightening the bearing (3), a first pre-tightening force borne by the bearing (3) is detected in real time by a stress collector (1); The pre-tightening mechanism (6) adjusts the second pre-tightening force applied by the pre-tightening sleeve (4) to the bearing (3) according to the first pre-tightening force collected by the stress collector (1).

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