Fixing mechanism and slip ring performance testing method

Abstract

The invention discloses a fixing mechanism and a slip ring performance testing method. The fixing mechanism comprises an operation table and a testing assembly arranged at the end of the operation table. The fixing assembly is used for fixing the sliding ring; the test assembly is connected with the slip ring through a connecting piece, the test assembly can change the stable state of the slip ring, the slip ring comprises a stator and a rotor which are arranged in the slip ring, and the slip ring is further provided with a power input terminal, a power output terminal, a communication input terminal and a communication output terminal. The test assembly simulates the real environment in the operation of the fan, and can test the static resistance and dynamic resistance of the slip ring. The real-time data acquisition system is used for carrying out communication data transceiving acquisition analysis on encoder data, and the contact stability and the vibration resistance of the slip ring are evaluated by comparing the resistance value change rate and the communication signal bit error rate under the static and dynamic working conditions.

Description

Technical Field

[0001] The present invention relates to the field of slip rings, and in particular to a fixing mechanism and a method for testing the performance of slip rings. Background Art

[0002] The wind power slip ring is the "dynamic nerve and blood vessel" of a wind turbine generator set, and its performance directly affects power generation efficiency, safety and economy. With the development of large-scale, intelligent wind turbines and offshore wind power, slip ring technology needs to be continuously innovated to meet the requirements of higher current, more complex environments and lower maintenance costs. The industry's dependence on slip rings with high reliability, long life and intelligent monitoring functions will continue to deepen, and related patents and R & D investment have become key areas of enterprise competition. As the single-unit capacity of wind turbines increases to 10MW+ or more, the slip ring needs to carry a higher current density. The slip ring is one of the components with a relatively high failure rate in wind turbines. When the wind turbine is operating at different wind speeds, the tower, nacelle and hub face different vibration frequencies. Industry data shows that slip ring failures account for 18%-25% of the electrical failures of wind turbines, and the average fault repair time reaches 48 hours, far exceeding that of the gearbox (72 hours) or the converter (24 hours). The dynamic contact contacts between the stator and rotor of the slip ring are the highest fault points. Poor contact, wear or insulation failure will lead to shutdown and even fire. The characteristics of the slip ring require regular cleaning and polishing, and the manual maintenance cost is high.

[0003] In view of the above problems, the present invention proposes a method for testing the performance of a slip ring in a laboratory after maintenance and repair, which is used to quickly verify the results of repair and maintenance, and avoid the imperfection of the traditional testing method and the secondary failure caused by invisible faults being put into operation. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is: how to quickly verify the results of repair and maintenance of the slip ring, avoid the imperfection of the traditional testing method, and prevent secondary failures caused by invisible faults being put into operation.

[0005] The above technical problem is solved by the following technical solutions: The present invention provides a fixing mechanism, which includes an operating table, a testing component arranged at the end of the operating table; and a fixing component for fixing the slip ring. The testing component is connected to the slip ring through a connecting piece, and the testing component can change the stable state of the slip ring.

[0006] In a preferred embodiment of the fixing mechanism of the present invention: the slip ring includes a stator and a rotor arranged inside the slip ring, and the slip ring is also provided with a power input terminal, a power output terminal, a communication input terminal and a communication output terminal.

[0007] In a preferred embodiment of the fixing mechanism of the present invention: the communication input terminal is used to access instruments and signals, and the power input terminal is used to access current.

[0008] In a preferred embodiment of the fixing mechanism of the present invention: The power output terminal is connected to the corresponding device through a wire to form a short - circuit loop.

[0009] In a preferred embodiment of the fixing mechanism of the present invention: The communication output terminal is connected to the corresponding device through a wire to form a short - circuit loop.

[0010] In a preferred embodiment of the fixing mechanism of the present invention: The fixing component includes a fixing table arranged at the end of the operating table, a sliding shaft fixedly connected to the end of the fixing table, an adjusting wheel connected to the side wall of the sliding shaft, a moving table surface arranged at the end of the fixing table, and a fixing frame fixedly connected to the moving table surface.

[0011] In a preferred embodiment of the fixing mechanism of the present invention: The adjusting wheel can drive the moving table surface to move along the sliding shaft.

[0012] In a preferred embodiment of the fixing mechanism of the present invention: The space between the two moving table surfaces is an accommodation space, and the accommodation space is used to place the slip ring.

[0013] To solve the above - mentioned technical problems, the present invention also provides a method for testing the performance of a slip ring: Applied to the fixing mechanism, it further includes fixing the stator of the slip ring to be tested at the end of the operating table through the fixing component, connecting the rotor end of the slip ring to the test component through a connecting piece; forming a closed loop by connecting the output terminal through a wire short - circuit line, connecting to the test instrument through the input terminal, and measuring the static contact resistance value; starting the driving and rotating device to rotate the rotor, and at the same time controlling the test component to apply vibrations with a preset frequency and amplitude to form a dynamic working condition; collecting the current, voltage waveform data of the rotor loop and the encoder communication signal in real - time under the dynamic working condition; evaluating the contact stability and anti - vibration performance of the slip ring by comparing the change rate of the resistance value and the bit error rate of the communication signal under the static and dynamic working conditions.

[0014] In a preferred embodiment of the method for testing the performance of the slip ring of the present invention: The slip ring is also provided with an encoder. By collecting and analyzing the communication data of the encoder data through a real - time data acquisition system, the anti - vibration performance of the encoder and the vibration error of the slip ring can be analyzed.

[0015] The beneficial effects of the present invention are as follows: The present invention simulates the real environment during the operation of the fan through the test component, and can test the static resistance and dynamic resistance of the slip ring;

[0016] Fix the slip ring through the fixing table, form a closed loop by connecting the output terminal of the slip ring through a wire short - circuit line, and measure the contact resistance value of the test loop corresponding to the short - circuit loop;

[0017] The encoder data is collected, transmitted, received, and analyzed through a real-time data acquisition system. By comparing the change rates of resistance values and the bit error rates of communication signals under static and dynamic working conditions, the contact stability and anti-vibration performance of the slip ring are evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention. Among them:

[0019] Figure 1 Shows the schematic diagram of the experimental state of the slip ring of the fixing mechanism Figure 1 ;

[0020] Figure 2 Shows the schematic diagram of the structure of the slip ring of the fixing mechanism;

[0021] Figure 3 Shows the top view of the structure of the slip ring of the fixing mechanism;

[0022] Figure 4 Shows the schematic diagram of the experimental state of the slip ring of the fixing mechanism Figure 2 ;

[0023] Figure 5 Shows the schematic diagram of the connection for the performance test of the slip ring of the fixing mechanism;

[0024] Figure 6 Shows the internal equivalent circuit diagram of the slip ring of the fixing mechanism;

[0025] Figure 7 Shows the schematic diagram of the structure of the fixing component of the fixing mechanism.

[0026] In the figure: 1, operating platform; 2, test component; 21, multi-directional moving platform; 22, rotating platform; 23, vibration table; 24, servo motor; 3, fixing component; 31, fixing table; 32, sliding shaft; 33, adjusting wheel; 34, moving table surface; 35, fixing frame; 36, accommodating space; 4, slip ring; 41, stator; 42, rotor; 43, connecting piece; X1, power input terminal; X3, power output terminal; X2, communication input terminal; X4, communication output terminal; 5, encoder; D, communication module; E, remote control system; F, milliohm meter; G, oscilloscope; H, power supply; A, conductive ring; B, brush; L, wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the specific embodiments and the drawings.

[0028] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention. However, these terms may vary according to the intention of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0029] Referring to Figure 1 As shown, this embodiment provides a fixing mechanism, including an operating table 1, a testing component 2 disposed at the end of the operating table 1; and a fixing component 3 for fixing the slip ring 4. The testing component 2 is connected to the slip ring 4 through a connecting member 43, and the testing component 2 can change the stable state of the slip ring 4.

[0030] Referring to Figure 4 As shown, it should be noted that the testing component 2 includes a multi-directional moving platform 21 that can be adjusted along three directions of the X-axis, Y-axis, and Z-axis, and a rotating platform 22 connected to the top of the multi-directional moving platform 21. The rotating platform 22 is connected to a servo motor 24, and a vibration table 23 is also connected below the operating table 1.

[0031] Referring to Figure 4 As shown, wherein the connecting member 43 is made of a flexible material, and a flexible connection belt can be selected. Threaded holes are provided on the rotating platform 22, and bolt fixing holes are provided at both ends of the flexible connection belt. One end of the flexible connection belt is fixed to the threaded hole of the rotating platform 22 through bolts, and the other end is connected to the fixing screw inside the connector cavity of the slip ring 4. Such a setting can solve the problem of non-concentric rotation between the testing component 2 and the slip ring 4.

[0032] Referring to Figure 4 As shown, by adjusting the multi-directional moving platform 21, the rotating platform 22 can be connected to slip rings 4 of different models through the flexible connecting member 43.

[0033] Referring to Figure 2 and Figure 3 As shown, in some embodiments, the slip ring 4 includes a stator 41 and a rotor 42 disposed inside the slip ring 4. The slip ring 4 is also provided with a power input terminal X1, a power output terminal X3, a communication input terminal X2, and a communication output terminal X4.

[0034] Referring to Figure 2 and Figure 3 As shown, specifically, the communication input terminal X2 is used to access instruments and signals, and the power input terminal X1 is used to access current. The power output terminal X3 is connected to the corresponding device through a wire L to form a short-circuit loop. The communication output terminal X4 is connected to the corresponding device through a wire L to form a short-circuit loop.

[0035] Reference Figure 7 As shown, further, the fixing component 3 includes a fixing table 31 provided at the end of the operating table 1, a sliding shaft 32 fixedly connected to the end of the fixing table 31, an adjusting wheel 33 connected to the side wall of the sliding shaft 32, a moving table surface 34 provided at the end of the fixing table 31, and a fixing frame 35 fixedly connected to the moving table surface 34.

[0036] Furthermore, the adjusting wheel 33 can drive the moving table surface 34 to move along the sliding shaft 32. The space between the two moving table surfaces 34 is an accommodation space 36 for placing the slip ring 4.

[0037] It should be noted that by rotating the adjusting wheel 33, the moving table surface 34 can move along the sliding shaft 32. There are two sets of the sliding shaft 32, the moving table surface 34, the adjusting wheel 33, and the fixing frame 35 arranged mirror-symmetrically along the central axis of the fixing table 31. Adjusting the adjusting wheels 33 on the side walls of the two moving table surfaces 34 can change the size of the accommodation space 36 between the two fixing frames 35, so that the fixing component 3 can adapt to slip rings 4 of different sizes. It should be noted that the adjusting wheel 33 has a self-locking function to fix the slip ring 4 in the accommodation space 36 between the two fixing frames 35.

[0038] Reference Figure 5 and Figure 6 As shown, in some embodiments, the present invention also provides a method for testing the performance of the slip ring 4, which is applied to the fixing mechanism and further includes fixing the stator 41 of the slip ring 4 to be tested at the end of the operating table 1 through the fixing component 3, and connecting the end of the rotor 42 of the slip ring 4 to the testing component 2 through the connecting piece 43;

[0039] Form a closed loop by short-circuiting the output terminals with the wire L, connect to the testing instrument through the input terminals, and measure the static contact resistance value; start the rotating platform 22 to rotate the rotor 42, and at the same time apply vibrations with a preset frequency and amplitude to the rotating platform 22 to form a dynamic working condition.

[0040] During the dynamic working condition, real-time collect the current, voltage waveform data of the rotor 42 circuit and the communication signal of the encoder 5; evaluate the contact stability and anti-vibration performance of the slip ring 4 by comparing the resistance value change rate and the communication signal error rate under the static and dynamic working conditions.

[0041] The present invention forms a closed loop by short-circuiting the output end of the rotor 42 of the slip ring 4 with the wire L, so that the resistance of each channel in the true working state can be measured from the input terminal at the stator 41 end when the slip ring 4 to be tested is running, solving the problem of the complex measurement steps of the traditional test of the stator 41 and the rotor 42.

[0042] Reference Figure 5, the positive terminal of the power supply H line is output from the power output terminal X3 of the slip ring 4 and connected to the power input terminal X1 on the slip ring 4. The internal brush B of the slip ring 4 is connected to the conductive ring A and then to one end of the power output terminal X3. A shorting wire L is used to connect to the other end of the power output terminal X3, and it is connected to the other terminal of the power input terminal X1 through the internal channel. This terminal is connected to the positive terminal of the load tester with a wire L, and the tester load is connected to the negative terminal of the power supply H to form a complete loop.

[0043] As Figure 5 shown, then turn on the power supply and the load. The output terminal of the conductive ring A where the voltage and current waveforms can be observed can be connected to the high-power current and voltage test in a rotating state, and the real-time operating waveforms can be observed, solving the drawback that the traditional power part can only perform functional measurement but not performance testing.

[0044] Working process: First, place the slip ring 4 on the fixed table 31 and clamp the slide plate through two groups of fixing brackets 35. Then, adjust the multi-directional moving platform 21 so that the rotating platform 22 can be connected to the slip ring 4 through a flexible connection belt.

[0045] Then, the power input terminal X1 and the communication input terminal X2 set on the slip ring 4 are two-way incoming line terminals. Through the brush B in the slip ring 4 to the conductive ring A of the rotor 42 and then through the output wire L of the conductive ring A of the rotor 42 to the output terminals of the power output terminal X3 or the communication output terminal X4 to form two independent channels. When the external test shorting wire L, the output terminal and the output terminal of the conductive ring A are connected, a loop is formed between the power input terminal X1 and the communication input terminal X2, and the resistance value can be measured whether the rotor 42 is stationary or rotating.

[0046] Next, connect the power channel to form a loop and measure its resistance value. Here, a milliohm meter F can be used to measure its resistance value to judge its basic performance. Connect the power supply and the electronic load, and use an oscilloscope G to test and measure the voltage and current waveforms to determine its static performance.

[0047] Then, connect the communication channel in series with the communication line to form a loop and measure its resistance value to judge its basic performance. Connect it to the remote control system E, and send and receive data through the communication assistant software to measure its static performance.

[0048] Subsequently, connect the power output terminal X3 and the communication output terminal X4 through a wire L, connect the power input terminal X1 and the communication input terminal X2 to the test instrument or signal. Next, start the servo motor 24 to drive the rotating platform 22 to work and test the anti-vibration performance of the measured slip ring 4.

[0049] The encoder 5 is connected to the remote control system E, and sends communication data to judge the speed change parameters of the encoder 5 through static and dynamic methods to judge the anti-vibration performance of the slip ring 4.

[0050] Finally, it should be noted that the methods and devices described in detail above are only examples, and those skilled in the art can modify these examples in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A fixing mechanism, characterized in that: including, an operating table (1), a test component (2) arranged at the end of the operating table (1); and, a fixing component (3) for fixing a slip ring (4); the test component (2) is connected to the slip ring (4) through a connecting piece (43), and the test component (2) can change the stable state of the slip ring (4).

2. The fixing mechanism according to claim 1, wherein: The slip ring (4) includes a stator (41) and a rotor (42) arranged inside the slip ring (4), and the slip ring (4) is also provided with a power input terminal (X1), a power output terminal (X3), a communication input terminal (X2) and a communication output terminal (X4).

3. The fixing mechanism according to claim 2, characterized in that: The communication input terminal (X2) is used for accessing instruments and signals, and the power input terminal (X1) is used for accessing current.

4. The fixing mechanism according to claim 3, characterized in that: The power output terminal (X3) is connected to a corresponding device through a wire (L) to form a short-circuit loop.

5. The fixing mechanism according to claim 4, wherein: The communication output terminal (X4) is connected to a corresponding device through a wire (L) to form a short-circuit loop.

6. The fixing mechanism according to claim 5, characterized in that: The fixing component (3) includes a fixing table (31) arranged at the end of the operating table (1), a sliding shaft (32) fixedly connected to the end of the fixing table (31), an adjusting wheel (33) connected to the side wall of the sliding shaft (32), a moving table surface (34) arranged at the end of the fixing table (31), and a fixing frame (35) fixedly connected to the moving table surface (34).

7. The fixing mechanism according to claim 6, characterized in that: The adjusting wheel (33) can drive the moving table surface (34) to move along the sliding shaft (32).

8. The fixing mechanism according to claim 7, characterized in that: The space between two groups of the moving table surfaces (34) is an accommodating space (36) for placing the slip ring (4).

9. A performance test method for a slip ring (4), characterized in that: Applied to the fixing mechanism according to any one of claims 1 to 8, further including, fixing the stator (41) of the slip ring (4) to be measured at the end of the operating table (1) through the fixing component (3), and connecting the end of the rotor (42) of the slip ring (4) to the test component (2) through a connecting piece (43); forming a closed loop by short-circuiting the output terminal through a wire (L), and accessing a test instrument through the input terminal to measure the static contact resistance value; starting a driving and rotating device to rotate the rotor (42), and simultaneously controlling the test component (2) to apply vibrations with a preset frequency and amplitude to form a dynamic working condition; real-time collecting current, voltage waveform data of the rotor (42) loop and communication signals of an encoder (5) under the dynamic working condition; evaluating the contact stability and anti-vibration performance of the slip ring (4) by comparing the resistance value change rate and the communication signal error rate under static and dynamic working conditions.

10. The performance testing method of the slip ring (4) according to claim 9, characterized in that: The slip ring (4) is also provided with an encoder (5), and by collecting, analyzing communication data of the encoder (5) data through a real-time data acquisition system, the anti-vibration performance of the encoder (5) and the vibration error of the slip ring (4) can be analyzed.

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