Test stand for main shaft bearing of wind driven generator

Abstract

The invention discloses a test bed for a spindle bearing of a wind driven generator. The test bed comprises a base, a driving motor, a reduction gearbox, a universal joint, a main bearing frame, an axial oil cylinder, a loading disc, a transition disc, a shaft system and a radial oil cylinder, the test bed for the main shaft bearing of the wind driven generator can accurately simulate the stress and movement of the main shaft bearing of the wind driven generator in the operation process, so that the fatigue life of the bearing can be scientifically and accurately evaluated.

Description

Technical Field

[0001] The invention relates to the technical field of bearing test equipment, in particular to a wind turbine main shaft bearing test bench capable of applying axial and radial loads to a single test bearing and rotating the bearing. Background Art

[0002] Wind energy is a sustainable green energy source. In wind turbines, the main shaft bearing bears the main load and is an important part that is prone to failure. In the research and development process of the main shaft bearing, it is necessary to simulate the load and speed of the bearing in actual work, record its temperature rise, stress strain, speed torque and other parameters, and compare and analyze them with the theoretical calculation data to provide a test basis for the bearing reliability design. Nowadays, most main shaft bearing test benches are loaded with small loads, mainly for small megawatt wind turbine bearing tests. At this stage, with the continuous development of large megawatt wind turbine models, more stringent requirements are also put forward for the main shaft bearing test bench. Summary of the invention

[0003] The purpose of the present invention is to provide a wind turbine main shaft bearing test bench, which can more accurately simulate the force and movement of the wind turbine main shaft bearing during operation, so as to scientifically and accurately evaluate the fatigue life of the bearing.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A wind turbine main shaft bearing test bench comprises a base 1, a drive motor 2, a reduction gearbox 3, a universal joint 4, a main bearing frame 5, an axial oil cylinder 6, a loading plate 7, a transition plate 8, a shaft system 9 and a radial oil cylinder 10; the drive motor 2 is provided with the reduction gearbox 3, the reduction gearbox 3 is provided with the universal joint 4, the universal joint 4 is provided with the shaft system 9, the main bearing frame 5 and the transition plate 8 are provided at both ends of the shaft system 9, the loading plate 7 is provided on the transition plate 8, the axial oil cylinder 6 and the radial oil cylinder 10 are provided on the loading plate 7, and all components are installed on the base 1.

[0006] The shaft system 9 includes a first test bearing 9-1, a first test bearing seat 9-2, a first test bearing transition shaft 9-3, a second test bearing 9-4, a rotating shaft 9-5, a third test bearing 9-6, a test bearing 9-7, a test bearing transition shaft 9-8 and a pressure cover 9-9. The rotating shaft 9-5 is provided with the first test bearing transition shaft 9-3, the second test bearing 9-4 and the test bearing transition shaft 9-8. The first test bearing transition shaft 9-3 is provided with the first test bearing 9-1. The main bearing frame 5 is provided with the first test bearing seat 9-2. The test bearing transition shaft 9-8 is provided with the third test bearing 9-6, the test bearing 9-7 and the pressure cover 9-9. The third test bearing 9-6 and the test bearing 9-7 are installed back to back.

[0007] The axial oil cylinder 6 includes 8 to 10 oil cylinders, which are evenly distributed along the axial direction of the shaft system to generate axial load and overturning moment, and the radial oil cylinder 10 generates radial load and overturning moment.

[0008] The driving motor 2 , the reduction box 3 and the universal joint 4 are all standard parts, and together constitute the test bench driving system to drive the shaft system 9 to rotate.

[0009] The first test bearing 9-1 is replaceable, the third test bearing 9-6 is of the same model as the test bearing 9-7, and is loaded and tested together, and the second test bearing 9-4 is a series structure of several bearings.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The wind turbine main shaft bearing test bench of the present invention can apply axial, radial and overturning moment loads to a single bearing according to the load decomposition result, truly simulate the actual use state of the bearing, improve the accuracy and reliability of the test result, and has strong versatility and is suitable for different types of main shaft bearing tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 It is a schematic diagram of the installation of the spherical bearing of the present invention.

[0014] In the figure: 1. base; 2. drive motor; 3. reduction box; 4. universal joint; 5. main bearing frame; 6. axial cylinder; 7. loading plate; 8. transition plate; 9. shaft system; 9-1. first test bearing; 9-2. first test bearing seat; 9-3. first test bearing transition shaft; 9-4. second test bearing; 9-5. rotating shaft; 9-6. third test bearing; 9-7. test bearing; 9-8. test bearing transition shaft; 9-9. gland; 10. radial cylinder. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] like Figure 1 to Figure 2 A main shaft bearing of a wind turbine generator comprises a base 1, a driving motor 2, a reduction box 3, a universal joint 4, a main bearing frame 5, an axial cylinder 6, a loading plate 7, a transition plate 8, a shaft system 9 and a radial cylinder 10.

[0017] The drive motor 2 is provided with the reduction box 3, the reduction box 3 is provided with the universal joint 4, the universal joint 4 is provided with the shaft system 9, the drive motor 2, the reduction box 3 and the universal joint 4 are all standard parts, which are selected according to the test requirements, and together constitute the test bench drive system to drive the shaft system 9 to rotate.

[0018] In the shaft system 9, the first test bearing 9-1 is a replaceable structure. According to the load size of the test bearing, a suitable first test bearing 9-1 is selected, and its tooling first test bearing seat 9-2 and first test bearing transition shaft 9-3 are redesigned to carry out the test. The transition tooling is positioned by the stopper to ensure that the inner and outer axes are concentric with the rotating shaft 9-5.

[0019] In the shaft system 9, the second test bearing 9-4 is a fixed bearing. According to the load size of the test bench, several cylindrical roller bearings can be selected in series to increase the life of the second test bearing and ensure that the second test bearing does not need to be replaced during its life cycle.

[0020] In the shaft system 9, the third test bearing 9-6 and the test bearing 9-7 are of the same model, are installed back to back, and are pre-tightened against each other through the pressure cover 9-9. The loaded axial force is borne by the test bearing 9-7, and the reaction force is borne by the first test bearing seat 9-2. When replacing the test bearing 9-7, the third test bearing 9-6 and its tooling test bearing transition shaft 9-8, pressure cover 9-9 and transition plate 8 need to be replaced simultaneously.

[0021] The axial cylinder 6 includes 8 to 10 cylinders, which are evenly distributed along the axial direction of the shaft system and can generate axial load and overturning moment. The radial cylinder 10 can generate radial load and overturning moment. All cylinder forces act on the loading plate 7 and are transmitted to the shaft system 9 through the transition plate 8.

[0022] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the invention and are not intended to limit the present invention. Without departing from the novel spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wind turbine main shaft bearing test bench, characterized in that: The invention comprises a base (1), a driving motor (2), a reduction gearbox (3), a universal joint (4), a main bearing frame (5), an axial oil cylinder (6), a loading plate (7), a transition plate (8), a shaft system (9) and a radial oil cylinder (10); the driving motor (2) is provided with the reduction gearbox (3), the reduction gearbox (3) is provided with the universal joint (4), the universal joint (4) is provided with the shaft system (9), the main bearing frame (5) and the transition plate (8) are provided at both ends of the shaft system (9), the loading plate (7) is provided on the transition plate (8), the loading plate (7) is provided with the axial oil cylinder (6) and the radial oil cylinder (10), and all the components are mounted on the base (1).

2. The wind turbine main shaft bearing test bench according to claim 1, characterized in that: The shaft system (9) comprises a first test bearing (9-1), a first test bearing seat (9-2), a first test bearing transition shaft (9-3), a second test bearing (9-4), a rotating shaft (9-5), a third test bearing (9-6), a test bearing (9-7), a test bearing transition shaft (9-8) and a pressure cover (9-9); the rotating shaft (9-5) is provided with the first test bearing transition shaft (9-3), the second test bearing (9-4) and the test bearing transition shaft (9-8); the first test bearing transition shaft (9-3) is provided with the first test bearing (9-1); the main bearing frame (5) is provided with the first test bearing seat (9-2); the test bearing transition shaft (9-8) is provided with the third test bearing (9-6), the test bearing (9-7) and the pressure cover (9-9); the third test bearing (9-6) and the test bearing (9-7) are installed in a back-to-back manner.

3. The wind turbine main shaft bearing test bench according to claim 1, characterized in that: The axial oil cylinder (6) comprises 8 to 10 oil cylinders which are evenly distributed along the axial direction of the shaft system and generate an axial load and an overturning moment, and the radial oil cylinder (10) generates a radial load and an overturning moment.

4. The wind turbine main shaft bearing test bench according to claim 1, characterized in that: The driving motor (2), reduction box (3) and universal joint (4) are all standard parts, and together constitute a test bench driving system to drive the shaft system (9) to rotate.

5. The wind turbine main shaft bearing test bench according to claim 1, characterized in that: The first test bearing (9-1) is replaceable, the third test bearing (9-6) is of the same model as the test bearing (9-7) and is jointly loaded and tested, and the second test bearing (9-4) is a structure of several bearings connected in series.

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