CN101713703B - Variable-pitch slewing bearing experiment table of wind driven generator - Google Patents

Abstract

The invention discloses a wind driven generator variable pitch slewing bearing experiment table which comprises an axial loading frame, an axial force loading oil cylinder, a total loading plate, two variable pitch slewing bearings to be tested with the same specification, a large gear, a left connecting plate, a right connecting plate, a slewing bearing mounting base, an overturning moment loading arm, an overturning moment loading oil cylinder, a power driving module and a radial force loading oil cylinder. The invention can simulate the running state of the wind driven generator variable-pitch slewing bearing under various complex loads in a vertical installation state, simultaneously detect the starting torque of the variable-pitch slewing bearing, monitor the resistance torque, the roller path abrasion loss, the lubricant temperature and the vibration signal in real time during running and evaluate the fatigue life of the variable-pitch slewing bearing.

Description

Wind turbine pitch slewing bearing test bench

technical field

The invention relates to a large-scale bearing test bench, in particular to a wind power generator pitch-variable slewing bearing test bench.

Background technique

The slewing ring can generally be regarded as a giant bearing, mainly composed of inner ring, outer ring, rolling elements, spacer blocks, etc. It is an indispensable part of almost all large parts that need to rotate relative to each other. At present, the mainstream MW-level wind turbines on the market are almost all variable-pitch wind turbines, whose main feature is that the root of each blade is connected to the hub through a set of pitch-variable slewing bearings. In recent years, the installed capacity of wind turbines at home and abroad has grown rapidly, which has driven the development of the wind turbine pitch slewing bearing industry. Many domestic and foreign manufacturers have put into production wind turbine pitch slewing bearings. However, the pitch slewing bearings of wind turbines are generally subject to complex loads, and the requirements for life and reliability are extremely high. The quality of many pitch slewing bearings at home and abroad is difficult to guarantee.

At present, there are few wind turbine pitch slewing bearing manufacturers at home and abroad that can provide experimental data that can prove the quality of their products. Domestic and foreign standards and many slewing bearing manufacturers have their own calculation formulas for bearing capacity and life of slewing bearings. The derivation and inspection of these calculation formulas are based on horizontally installed slewing bearings. However, the pitch slewing bearings of wind turbines often work In vertical or inclined installation state. In addition, comparing the relevant calculation formulas of various slewing bearings, it is found that these formulas have the same form, that is, the correction factor multiplied by the basic rated life. For the slewing bearings of the same specification, the basic rated life is the same, but different standards or Manufacturers handle the correction coefficient differently, so the correction coefficient reflects the production quality and working conditions of each manufacturer's slewing bearing to a certain extent. The correction of the coefficients needs to be based on a large number of experiments and practical application statistics, and there is no experimental equipment in China that can perform complex loading on the pitch slewing bearings of different specifications of wind turbines and collect relevant signals.

Contents of the invention

The purpose of the present invention is to propose a wind power generator pitch slewing bearing test bench that can carry out life experiments on wind power generator pitch slewing bearings of different specifications, which can be used to evaluate the manufacturing quality of wind power generator pitch slewing bearings. The calculation model related to the slewing bearing provides experimental data.

Technical scheme of the present invention is:

A wind turbine pitch slewing bearing test bench, comprising a slewing bearing installation base, the slewing bearing installation base is placed vertically, and a pair of first pitch slewing bearings to be tested and a second pitching slewing bearing to be tested are vertically installed on it The slewing bearing, the moving rings of the first variable pitch slewing bearing to be tested and the second variable pitch slewing bearing to be tested are respectively installed on both sides of the large gear, and the first variable pitch slewing bearing to be tested and the second variable pitch slewing bearing to be tested are respectively installed on both sides of the large gear. The paddle slewing bearing is respectively connected to the total loading plate and the installation base of the slewing bearing through the left connecting plate and the right connecting plate; The gear is connected to the power drive module, the right end of the total loading plate is connected to the overturning moment loading arm passing through the first pitch slewing bearing to be tested and the second pitch slewing bearing to be tested, and the right end of the overturning moment loading arm is connected to the overturning moment loading cylinder.

Experiments on pitch slewing bearings of different specifications can be realized by replacing the left connecting plate and the right connecting plate.

The first pitch slewing bearing to be tested and the second pitch slewing bearing to be tested are two sets of pitch slewing bearings of the same specification, the first pitch slewing bearing to be tested and the second pitch slewing bearing to be tested The moving ring of the support is respectively connected to the gear wheel by bolts, and the fixed rings of the first variable pitch slewing bearing to be tested and the second pitch slewing bearing to be tested are respectively connected to the left connecting plate and the right connecting plate by bolts.

The total loading plate is connected to the left connecting plate by bolts, and the right connecting plate is connected to the installation foundation of the slewing bearing by bolts.

The loading of the slewing bearing of the wind turbine is realized through the combined loading of the axial force loading cylinder, overturning moment loading cylinder and radial force loading cylinder. In the vertical installation state, the operating state of the wind turbine pitch slewing bearing is simulated under various complex loads. , and at the same time detect the starting torque of the pitch slewing bearing, monitor the resistance torque, lubricant temperature, and vibration signal during operation in real time, and evaluate the fatigue life of the pitch slewing bearing.

The power drive module is composed of a hydraulic motor or an electric motor, a torque sensor, a pinion, and an installation infrastructure; the torque sensor is installed between the hydraulic motor and the pinion or between the motor and the pinion, and the torque sensor passes through a coupling or an expansion The sleeve is connected with the hydraulic motor or electric motor, and the torque sensor is connected with the pinion through an expansion sleeve or coupling.

Temperature sensors are provided in one or several oil injection holes of the first pitch slewing bearing to be tested and/or the second pitch slewing bearing to be tested.

The torque sensor collects the slewing resistance torque signal of the tested pitch slewing bearing in real time, and the lubricant temperature signal is collected in real time through the temperature sensor installed in the oil injection hole.

The invention adopts a hydraulic loading method, the overturning moment is applied through the overturning moment loading oil cylinder, the axial force is applied through the axial force loading oil cylinder, and the combination of the radial force loading oil cylinder and the overturning moment loading oil cylinder realizes the loading of any radial force.

During the experiment, two sets of wind turbine pitch slewing bearings of the same specification were used for simultaneous experiments. During installation, the moving coils of the two pitching slewing bearings were installed opposite each other, and a large gear was fixedly connected between the two moving coils. During the experiment, through the large gear The moving coil that drives the pitch slewing bearing rotates relative to the fixed coil. The fixed rings of the two pitch slewing bearings are fixedly connected to the total loading plate and the installation foundation of the slewing bearings through the left connecting plate and the right connecting plate respectively with bolts.

The beneficial effects of the present invention are:

The invention can monitor in real time the change of the slewing resistance torque of the slewing support, the change of the temperature of the lubricating oil, and the contact vibration of the rolling body and the raceway during the loading experiment of the pitch slewing bearing of the wind power generator, so as to provide a criterion for the failure of the slewing bearing.

The test bench of the present invention can complete the fatigue experiment of large-scale wind turbine pitch slewing bearings installed vertically with different specifications under complex loads, can be used to detect the quality of pitch slewing bearing products, and provide a basis for evaluating the quality of pitch slewing bearings , to provide a large amount of experimental data for the establishment of related calculation models.

The present invention applies the overturning moment through the overturning moment loading arm connected with the overturning moment loading oil cylinder, which can simulate the running state of the pitch-changing slewing bearing of the wind power generator under various complex loads in the vertical installation state, and detect the start-up of the pitch-changing slewing bearing at the same time Torque, real-time monitoring of resistance torque, lubricant temperature, and vibration signals during operation, to evaluate the fatigue life of pitch slewing bearings. The utility model has the advantages of reliable operation, wide applicability, accurate simulation, and is convenient for installation and debugging.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic cross-sectional view of the overall structure of the present invention.

Description of parts in the figure: 1. Axial loading frame, 2. Axial force loading cylinder, 3. Total loading plate, 4. Left connecting plate, 5. The first variable pitch slewing bearing to be tested, 6. Big gear, 7 . The second variable pitch slewing bearing to be tested, 8. Right connecting plate, 9. Installation foundation of the slewing bearing, 10. Overturning moment loading arm, 11. Overturning moment loading oil cylinder, 12. Power drive module, 13. Radial force loading Oil cylinder, 14, pinion.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

A wind turbine pitch slewing bearing test bench, comprising a slewing bearing installation base 9, the slewing bearing installation base 9 is placed vertically, and a pair of the first pitch slewing bearing 5 to be tested and the first slewing bearing 5 to be tested are vertically installed on it. The second pitch slewing bearing 7, the moving coils of the first pitch slewing bearing 5 to be tested and the second pitch slewing bearing 7 to be tested are respectively installed on both sides of the large gear 6, and the first pitch slewing bearing to be tested 5 and the second pitch slewing bearing 7 to be tested are respectively connected to the total loading plate 3 and the slewing bearing installation base 9 through the left connecting plate 4 and the right connecting plate 8; the left end of the total loading plate 3 is connected to the loading cylinder 2 through the axial force loading Frame 1, the lower end of the total loading plate 3 is provided with a radial force loading oil cylinder 13, the large gear 6 is connected to the power drive module 12, and the right end of the total loading plate 3 is connected through the first variable pitch slewing bearing 5 to be tested and the second to be tested. The overturning moment loading arm 10 inside the pitch slewing bearing 7 is connected to the overturning moment loading oil cylinder 11 at the right end of the overturning moment loading arm 10 .

Experiments on pitch slewing bearings of different specifications can be realized by replacing the left connecting plate 4 and the right connecting plate 8 .

The first pitch slewing bearing 5 to be tested and the second pitch slewing bearing 7 to be tested are two sets of pitch slewing bearings of the same specification, the first pitch slewing bearing 5 to be tested and the second pitch slewing bearing to be tested The moving coil of the slewing bearing 7 is respectively connected to the gear wheel 6 by bolts, and the fixed coils of the first variable pitch slewing bearing 5 to be tested and the second pitching slewing bearing 7 to be tested are respectively connected to the left connecting plate 4 and the right by bolts Board 8 is connected.

The total loading plate 3 is connected with the left connecting plate 4 by bolts, and the right connecting plate 8 is connected with the slewing bearing installation base 9 by bolts.

The loading of the slewing bearing of the wind turbine is realized through the combined loading of the axial force loading cylinder 2, the overturning moment loading cylinder 11, and the radial force loading cylinder 13. In the vertical installation state, the wind turbine pitch slewing bearing is simulated under various complex loads. At the same time, it detects the starting torque of the pitch slewing bearing, monitors the resistance torque, lubricant temperature, and vibration signal during operation in real time, and evaluates the fatigue life of the pitch slewing bearing.

The power drive module 12 is composed of a hydraulic motor or an electric motor, a torque sensor, a pinion 14, and an installation infrastructure; the torque sensor is installed between the hydraulic motor and the pinion 14 or between the motor and the pinion 14, and the torque sensor passes through the Or the expansion sleeve is connected with the hydraulic motor or the motor, and the torque sensor is connected with the pinion 14 through the expansion sleeve or coupling.

Temperature sensors are provided in one or several oil injection holes of the first pitch slewing bearing 5 to be tested and/or the second pitch slewing bearing 7 to be tested.

During specific implementation, a temperature sensor may be provided in one or several oil injection holes of the first pitch slewing bearing 5 to be tested or the second pitch slewing bearing 7 to be tested. The first variable pitch slewing bearing 5 to be tested or the second variable pitch slewing bearing 7 to be tested is a kind of slewing bearing, and the oil injection hole is the self-lubricating structure of the slewing bearing product. During the experiment, it is only necessary to fill any one or several The hole can be changed to the temperature sensor installation hole.

The torque sensor collects the slewing resistance torque signal of the tested pitch slewing bearing in real time, and the lubricant temperature signal is collected in real time through the temperature sensor installed in the oil injection hole.

As shown in Fig. 1 and Fig. 2, firstly, the moving ring and the gear 6 of the two wind turbine pitch slewing bearings to be tested are connected by bolts, and the fixed ring and the right side of the second pitch slewing bearing 7 to be tested are connected. The plates 8 are fixedly connected by bolts, the right connecting plate 8 is fixedly connected by bolts through the slewing bearing installation base 9 fixed on the foundation, the left connecting plate 4 is fixedly connected with the first pitch slewing bearing 5 to be tested by bolts, and the total loading plate 3 It is fixedly connected with the left connecting plate 4 by bolts, and the overturning moment loading arm 10 is fixedly connected with the total loading plate 3 . The axial force loading cylinder 2 is fixedly connected with the axial force loading frame 1 fixed on the foundation through bolts, and is connected with the total loading plate 3 through pins; the radial force loading cylinder 13 is fixedly connected with the foundation, and is connected with the total loading plate 3 through pins The overturning moment loading oil cylinder 11 is fixedly connected to the foundation, and is connected with one end of the overturning moment loading arm 10 through a pin, and the load of each oil cylinder is controlled separately by the control system to realize the combination of various complex loads. The power drive module 12 provides power for the rotary motion of the pitch slewing bearing to be tested.

Claims (5)

1. A wind-driven generator variable pitch slewing bearing test bench, comprising a slewing bearing installation base (9), is characterized in that the said slewing bearing installation base (9) is vertically placed, and a pair of first variables to be tested are vertically installed on it. The moving coils of the propeller slewing bearing (5) and the second pitch slewing bearing (7) to be tested, the first pitch slewing bearing (5) to be tested and the second pitch slewing bearing (7) to be tested are respectively installed On both sides of the large gear (6), the first pitch slewing bearing (5) to be tested and the second pitch slewing bearing (7) to be tested pass through the left connecting plate (4) and the right connecting plate (8) respectively Connect the total loading plate (3) and the installation base of the slewing bearing (9); the left end of the total loading plate (3) is connected to the loading frame (1) through the axial force loading cylinder (2), and the lower end of the total loading plate (3) is provided with a diameter Force loading oil cylinder (13), large gear (6) is connected to power drive module (12), and the right end of total loading plate (3) is connected to pass through the first variable pitch slewing bearing (5) to be tested and the second variable pitch slewing bearing to be tested. The overturning moment loading arm (10) inside the paddle slewing bearing (7), and the right end of the overturning moment loading arm (10) is connected with the overturning moment loading oil cylinder (11). 2. The wind power generator pitch slewing bearing test bench according to claim 1, characterized in that the first variable pitch slewing bearing (5) to be tested and the second pitch slewing bearing (7) to be tested are two Set the pitch slewing bearings of the same specification, the moving coils of the first pitch slewing bearing (5) to be tested and the second pitch slewing bearing (7) to be tested are respectively connected to the gearwheel (6) by bolts, The fixed rings of the first pitch slewing bearing (5) and the second pitch slewing bearing (7) to be tested are respectively connected with the left connecting plate (4) and the right connecting plate (8) by bolts. 3. The wind power generator pitch-changing slewing bearing test bench according to claim 1, characterized in that the total loading plate (3) is connected with the left connecting plate (4) by bolts, and the right connecting plate (8) is installed with the slewing bearing The foundation (9) is connected by bolts. 4. wind-driven generator pitch-changing slewing bearing experimental platform according to claim 1 is characterized in that described power drive module (12) is made up of hydraulic motor or electric machine, torque sensor, pinion (14), installation base structure; Torque The sensor is installed between the hydraulic motor and the pinion (14) or between the motor and the pinion (14), the torque sensor is connected to the hydraulic motor or the motor through a coupling or expansion sleeve, and the torque sensor is connected through an expansion sleeve or coupling Connect with pinion (14). 5. The wind power generator pitch slewing bearing test bench according to claim 1, characterized in that the first pitch slewing bearing (5) to be tested and/or the second pitch slewing bearing (7) to be tested One or several oil injection holes are provided with temperature sensors.

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