Fan main shaft bearing testing machine

Abstract

The invention discloses a fan main shaft bearing testing machine, which belongs to the field of fan bearing testing, solves the problems of complicated testing structure, complicated testing steps and inaccurate testing in the prior art, and adopts the technical scheme that the fan main shaft bearing testing machine comprises a platform, a main shaft arranged on the platform in a split manner, and a driving assembly for driving the main shaft to rotate, the platform is further provided with a testing station which is located in the radial direction of the main shaft and used for testing a bearing bush of a single sliding bearing, the testing station is provided with a first pressure sensor, a second pressure sensor and a loading unit, and the first pressure sensor is used for detecting oil film pressure between the bearing bush of the sliding bearing and the main shaft; the loading unit is used for driving a bearing bush of the sliding bearing in the radial direction of the main shaft so as to provide radial loading force for the bearing bush of the sliding bearing, and the second pressure sensor is used for detecting the radial loading force provided by the loading unit. According to the invention, the test structure and the test steps are simplified while the test accuracy is mainly improved.

Description

Technical Field

[0001] The invention relates to the field of fan bearing testing, in particular to a fan main shaft bearing testing machine. Background Art

[0002] Due to the high cost and difficult maintenance of rolling bearings, the main shaft bearings of wind turbines are gradually replaced by sliding bearings. In order to achieve the performance test of sliding bearings, the prior art, such as the invention patent CN117538056A, discloses a five-degree-of-freedom loading wind turbine main shaft sliding bearing test bench, in which two sets of sliding bearings are arranged in front and behind the main shaft, and six loading elements provide five degrees of freedom loading force to be applied to the loading plate, and then transmitted to the sliding bearing through the loading bushing, rolling bearing, and hollow conical main shaft. The force acting on the sliding bearing is transmitted layer by layer, which may be distorted, and the structure is relatively complicated. Two sets of sliding bearings must be replaced for each test, which is troublesome and costly. The sliding bearings of the main shaft of the wind turbine are usually split structures, and the force of the sliding bearings is concentrated on the bearing shells of several sliding bearings. Summary of the invention

[0003] The purpose to be achieved by the present invention is to provide a fan main shaft bearing testing machine, which solves the problems of complex test structure, complex test steps and inaccurate test in the existing test, improves the test accuracy and simplifies the test structure and test steps.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a wind turbine main shaft bearing testing machine, comprising a platform, a main shaft separately arranged on the platform, and a driving assembly for driving the main shaft to rotate, the platform is also provided with a testing station located in the radial direction of the main shaft and used to test the bearing shell of a single sliding bearing, the testing station is provided with a first pressure sensor, a second pressure sensor and a loading unit, the first pressure sensor is used to detect the oil film pressure between the bearing shell of the sliding bearing and the main shaft, the loading unit is used to drive the bearing shell of the sliding bearing along the radial direction of the main shaft to provide a radial loading force to the bearing shell of the sliding bearing, and the second pressure sensor is used to detect the radial loading force provided by the loading unit.

[0005] After adopting the above technical scheme, the present invention has the following advantages: First, since the force on the main shaft during operation is not evenly distributed on the entire sliding bearing, but concentrated on the bearing shells of certain specific sliding bearings, and the bearings of the sliding bearings mainly bear radial loads, testing the bearing shells of a single sliding bearing can focus more accurately on the actual key force-bearing parts, and there is no need to replace the entire bearing assembly every time, which not only reduces the replacement time and cost, but also improves the test efficiency and simplifies the structure. Secondly, since the sliding bearing is no longer installed on the main shaft, but is located in an independent test station, the loading force of the loading unit can be directly applied to the bearing shell of the sliding bearing, avoiding the force distortion problem caused by transmission through multiple intermediate components. The first pressure sensor detects the oil film pressure, and the second pressure sensor monitors the loading force, thereby ensuring the accuracy of the loading force as much as possible, and can better simulate the force distribution under actual working conditions, providing more reliable test results.

[0006] Furthermore, the first pressure sensor is located on the main shaft.

[0007] By adopting the above-mentioned technical solution, in the prior art, the first pressure sensor is usually installed on the bearing, which can only test the oil film pressure at a certain point. Since the main shaft is rotating, the first pressure sensor is installed on the main shaft, which can measure the oil film pressure of the entire contact position between the main shaft and the sliding bearing, making the measurement data richer.

[0008] Furthermore, at least two of the first pressure sensors are provided.

[0009] By adopting the above-mentioned technical solution, the oil film pressure at different positions can be measured more accurately, and the changes in oil film pressure at different positions of the spindle during rotation can be monitored in real time. The multi-point measurement method reduces the possible measurement errors of a single first pressure sensor and provides more comprehensive and accurate data.

[0010] Furthermore, the second pressure sensor is located between the output end of the loading unit and the bearing bush of the sliding bearing.

[0011] By adopting the above-mentioned technical solution, the second pressure sensor is directly located between the output end of the loading unit and the bearing shell of the sliding bearing, which can measure the radial loading force applied to the bearing shell in real time and accurately, reducing the error caused by the intermediate transmission link and providing more accurate loading force data.

[0012] Furthermore, the main shaft includes an inner ring and an outer ring, the inner ring is made of a rigid material, and the outer ring is made of ductile iron.

[0013] By adopting the above technical solution, the use of ductile iron can be greatly reduced by using ductile iron in the outer ring instead of the entire main shaft. After the outer ring is worn, only the outer ring needs to be cut off to save costs. In addition, the inner ring of rigid material ensures the overall rigidity and deformation resistance of the main shaft.

[0014] Furthermore, the outer ring is embedded in the inner ring; or, the outer ring is sleeved on the inner ring.

[0015] The above technical solution makes it easy to install and replace the outer ring after it is worn.

[0016] Furthermore, the spindle includes a wheel portion located at the testing station, and a shaft portion fixedly connected to the wheel portion, and the shaft portion is transmission-connected to the driving assembly.

[0017] Through the above technical solution, a wheel-axle form is adopted, the shorter wheel portion meets the test requirements, and the diameter of the shaft portion is smaller, making the fan main shaft bearing tester more compact as a whole.

[0018] Furthermore, the platform is provided with two bearing seats, the shaft and the bearing seats are rotatably connected, and the two bearing seats are centrally symmetrically arranged about the shaft.

[0019] Through the above technical solution, the symmetrical arrangement of the two bearing seats can ensure that the load borne by the shaft is evenly distributed at both ends, reducing the eccentric load problem caused by uneven force on one side and improving the overall stability of the system.

[0020] Furthermore, the platform is provided with a first base and a second base which are separately arranged, the spindle and the test station are arranged on the first base, the drive assembly is arranged on the second base, and the drive assembly is connected to the spindle through a transmission assembly.

[0021] Through the above technical solutions, the drive components usually generate vibrations. Placing them on an independent second base can effectively isolate these vibrations and prevent them from being transmitted to the spindle and test station, thereby improving test accuracy and stability. The split base supports modular design, and components can be quickly adjusted or replaced according to different needs, enhancing the flexibility and adaptability of the system.

[0022] Furthermore, the drive assembly includes a motor, a reducer, a torque sensor and a coupling, the output end of the motor is connected to the input end of the reducer through the coupling, the output end of the reducer is connected to the input end of the torque sensor through the coupling, and the output end of the torque sensor is connected to the main shaft through the coupling.

[0023] Through the above technical solution, by integrating the torque sensor in the drive assembly, the torque transmitted to the main shaft can be monitored in real time, and the output of the motor can be adjusted according to the actual torque value to achieve more accurate loading control. The various components are connected through couplings, so that each part can be disassembled and replaced independently, simplifying the maintenance process and reducing maintenance costs and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the fan main shaft bearing testing machine of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the main shaft in the present invention;

[0027] Figure 3 It is a structural schematic diagram of another viewing angle of the main axis in the present invention;

[0028] In the figure, 10, platform; 20, main shaft; 21, inner ring; 22, outer ring; 23, wheel; 24, shaft; 30, test station; 31, first pressure sensor; 32, second pressure sensor; 33, loading unit; 40, bearing seat; 50, first base; 51, second base; 60, motor; 70, reducer; 80, torque sensor; 90, coupling; 100, bearing. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein.

[0031] It should be understood that in various embodiments of the present invention, the size of the serial numbers of the processes does not mean the order of execution. The execution order of the processes should be determined by their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0032] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0033] It should be understood that in the present invention, "plurality" refers to two or more than two. "And / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0034] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0035] like Figures 1 to 3 As shown, the present invention provides a wind turbine main shaft bearing testing machine, including a platform 10, a main shaft 20 separately arranged on the platform 10, and a driving component for driving the main shaft 20 to rotate. The platform 10 is also provided with a testing station 30 located in the radial direction of the main shaft 20 and used to test the bearing 100 of a single sliding bearing. The testing station 30 is provided with a first pressure sensor 31, a second pressure sensor 32 and a loading unit 33. The first pressure sensor 31 is used to detect the oil film pressure between the bearing 100 of the sliding bearing and the main shaft 20. The loading unit 33 is used to drive the bearing 100 of the sliding bearing along the radial direction of the main shaft 20 to provide a radial loading force to the bearing 100 of the sliding bearing. The second pressure sensor 32 is used to detect the radial loading force provided by the loading unit 33.

[0036] Firstly, since the force on the main shaft 20 during operation is not evenly distributed on the entire sliding bearing, but concentrated on the bushings 100 of certain specific sliding bearings, and the bearings of the sliding bearings mainly bear radial loads, testing the bushings 100 of a single sliding bearing can focus more accurately on the key parts of the actual force, and there is no need to replace the entire bearing assembly every time, which not only reduces the replacement time and cost, but also improves the test efficiency and simplifies the structure. Secondly, since the sliding bearing is no longer installed on the main shaft 20, but is located in an independent test station 30, the loading force of the loading unit 33 can be directly applied to the bushing 100 of the sliding bearing, avoiding the problem of force distortion caused by transmission through multiple intermediate components. The first pressure sensor 31 detects the oil film pressure, and the second pressure sensor 32 monitors the loading force, thereby ensuring the accuracy of the loading force as much as possible, and can better simulate the force distribution under actual working conditions, providing more reliable test results.

[0037] It should be noted that during the operation of the spindle 20, the oil film pressure is a key indicator reflecting the lubrication performance and load-bearing capacity of the sliding bearing. The loading unit 33 is located below the spindle 20, and the loading unit 33 can drive the bearing 100 of the sliding bearing to contact the spindle 20 and apply the pressure required for the test.

[0038] In the prior art, the first pressure sensor 31 is installed on the bearing, and can only test the oil film pressure at a certain point. For this reason, in the present invention, the first pressure sensor 31 is located on the main shaft 20. Since the main shaft 20 is rotating, the oil film pressure of the entire contact position between the main shaft 20 and the sliding bearing can be measured, making the measurement data richer.

[0039] Furthermore, three first pressure sensors 31 are provided, and the three first pressure sensors 31 are arranged along the axial direction of the main shaft 20. The oil film pressure at different positions can be measured more accurately, and the oil film pressure changes at different positions of the main shaft 20 during rotation can be monitored in real time. The multi-point measurement method reduces the measurement error that may exist in a single first pressure sensor 31, and provides more comprehensive and accurate data.

[0040] In order to improve the accuracy of measuring the loading force applied to the bearing bush 100 of the sliding bearing, the second pressure sensor 32 is located between the output end of the loading unit 33 and the bearing bush 100 of the sliding bearing. The radial loading force applied to the bearing bush 100 can be measured in real time and accurately, reducing the error caused by the intermediate transmission link and providing more accurate loading force data.

[0041] Preferably, the loading unit 33 comprises a piston cylinder, a piston rod of the piston cylinder is connected to the second pressure sensor 32, a bearing bush 100 of the sliding bearing is fixed on the second pressure sensor 32, and the sliding bearing is driven to move up and down by the piston rod.

[0042] Since the drive assembly usually generates vibrations that affect the test of the bearing bush 100 of the sliding bearing, for this reason, in the present invention, the platform 10 is provided with a first base 50 and a second base 51 that are separately arranged, the spindle 20 and the test station 30 are arranged on the first base 50, the drive assembly is arranged on the second base 51, and the drive assembly is connected to the spindle 20 through a transmission assembly. Placing it on an independent second base 51 can effectively isolate these vibrations and prevent them from being transmitted to the spindle 20 and the test station 30, thereby improving the test accuracy and stability. The split base supports modular design, and components can be quickly adjusted or replaced according to different needs, which enhances the flexibility and adaptability of the system. The bearing seat 40 is also arranged on the first base 50.

[0043] Among them, the drive assembly includes a motor 60, a reducer 70, a torque sensor 80 and a coupling 90. The output end of the motor 60 is connected to the input end of the reducer 70 through the coupling 90, the output end of the reducer 70 is connected to the input end of the torque sensor 80 through the coupling 90, and the output end of the torque sensor 80 is connected to the main shaft 20 through the coupling 90. By integrating the torque sensor 80 in the drive assembly, the torque transmitted to the main shaft 20 can be monitored in real time, and the output of the motor 60 can be adjusted according to the actual torque value to achieve more accurate loading control. The various components are connected through the coupling 90, so that each part can be disassembled and replaced independently, which simplifies the maintenance process and reduces the maintenance cost and time. The drive assembly, the loading unit 33, the first pressure sensor 31, the second pressure sensor 32, and the torque sensor 80 are all controlled by software.

[0044] Since the main shaft 20 has a diameter of about 2m, it is relatively expensive to use ductile iron as a whole. Therefore, in the present application, the main shaft 20 includes an inner ring 21 and an outer ring 22, wherein the inner ring 21 is made of a rigid material and the outer ring 22 is made of ductile iron. By using ductile iron in the outer ring 22 instead of the entire main shaft 20, the amount of ductile iron used can be greatly reduced. After the outer ring 22 is worn, only the outer ring 22 needs to be cut off, which saves costs. In addition, the rigid inner ring 21 ensures the overall rigidity and anti-deformation ability of the main shaft 20.

[0045] In order to facilitate the replacement of the worn outer ring 22, the outer ring 22 is embedded in the inner ring 21. When the outer ring 22 is worn, it only needs to be cut off and a new outer ring 22 can be embedded. This saves costs and reduces processing time, thereby improving efficiency.

[0046] Since the actual main shaft 20 is relatively long, the entire fan main shaft bearing tester is relatively large in size. Therefore, in the present invention, the main shaft 20 includes a wheel portion 23 located at the test station 30, and a shaft portion 24 fixedly connected to the wheel portion 23, and the shaft portion 24 is transmission-connected to the drive assembly. By adopting the wheel and axle form, the shorter wheel portion 23 meets the test requirements, and the smaller diameter of the shaft portion 24 makes the fan main shaft bearing tester more compact as a whole.

[0047] In order to further improve the test stability, the platform 10 is provided with two bearing seats 40, the shaft 24 and the bearing seats 40 are rotatably connected, and the two bearing seats 40 are centrally symmetrically arranged about the shaft 24. This can ensure that the load borne by the shaft 24 is evenly distributed at both ends as much as possible, reduce the eccentric load problem caused by uneven force on one side, and improve the overall stability of the system.

[0048] During the test, only the most demanding bearing 100 in the sliding bearing can be tested. The bearing 100 is installed on the second pressure sensor 32, and the software control system starts the motor 60. The speed and torque required for the test are output to the main shaft 20 through the reducer 70. At the same time, the hydraulic system is started, and the bearing 100 of the sliding bearing is driven upward to contact the main shaft 20 through the piston rod and the pressure required for the test is applied. The friction coefficient between the sliding bearing bearing 100 and the main shaft 20 is calculated through the torque data output by the torque sensor 80.

[0049] It can be understood that in other embodiments, the outer ring is sleeved on the inner ring to facilitate installation and replacement of the outer ring after the outer ring is worn.

[0050] It can be understood that in other embodiments, the first pressure sensors may be provided in an appropriate number such as two, four, or five.

[0051] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A fan main shaft bearing testing machine, comprising a platform, a main shaft separately arranged on the platform, and a driving assembly for driving the main shaft to rotate, characterized in that: The platform is also provided with a test station located in the radial direction of the main shaft and used to test the bearing shell of a single sliding bearing. The test station is provided with a first pressure sensor, a second pressure sensor and a loading unit. The first pressure sensor is used to detect the oil film pressure between the bearing shell of the sliding bearing and the main shaft. The loading unit is used to drive the bearing shell of the sliding bearing along the radial direction of the main shaft to provide a radial loading force to the bearing shell of the sliding bearing. The second pressure sensor is used to detect the radial loading force provided by the loading unit.

2. The fan main shaft bearing testing machine according to claim 1, characterized in that: The first pressure sensor is located on the main shaft.

3. The fan main shaft bearing testing machine according to claim 2, characterized in that: There are at least two first pressure sensors.

4. The fan main shaft bearing testing machine according to claim 1, characterized in that: The second pressure sensor is located between the output end of the loading unit and the bearing shell of the sliding bearing.

5. The fan main shaft bearing testing machine according to claim 1, characterized in that: The main shaft comprises an inner ring and an outer ring, the inner ring is made of a rigid material, and the outer ring is made of ductile iron.

6. The fan main shaft bearing testing machine according to claim 5, characterized in that: The outer ring is embedded in the inner ring; or, the outer ring is sleeved on the inner ring.

7. The fan main shaft bearing testing machine according to claim 1, characterized in that: The main shaft comprises a wheel portion located at the testing station and a shaft portion fixedly connected to the wheel portion, and the shaft portion is transmission-connected to the driving assembly.

8. The fan main shaft bearing testing machine according to claim 1, characterized in that: The platform is provided with two bearing seats, the shaft portion and the bearing seats are rotatably connected, and the two bearing seats are centrally symmetrically arranged about the shaft portion.

9. The fan main shaft bearing testing machine according to claim 1, characterized in that: The platform is provided with a first base and a second base which are separately arranged. The spindle and the testing station are arranged on the first base. The driving assembly is arranged on the second base. The driving assembly is connected to the spindle through a transmission assembly.

10. The fan main shaft bearing testing machine according to claim 1, characterized in that: The driving assembly includes a motor, a reducer, a torque sensor and a coupling. The output end of the motor is connected to the input end of the reducer through the coupling, the output end of the reducer is connected to the input end of the torque sensor through the coupling, and the output end of the torque sensor is connected to the main shaft through the coupling.

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