A yawing slip ring carbon brush grinding device

Abstract

The application provides a yaw slip ring carbon brush grinding device, which is used for solving the problems of low grinding efficiency and large precision deviation of multiple carbon brushes on the same slip ring after grinding in the prior art. The device comprises a support frame, a rotating grinding assembly installed on the support frame, and a carbon brush mounting assembly installed on the support frame. The carbon brush mounting assembly comprises a support ring, the central axis of the support ring coincides with the rotating axis of the rotating grinding assembly, and the support ring is installed with a plurality of limiting mechanisms for mounting carbon brushes to be ground. The plurality of limiting mechanisms are arranged at equal angles along the central axis of the support ring. The application installs multiple carbon brushes on the support ring through multiple sets of limiting mechanisms, simultaneously grinds the multiple carbon brushes during the rotation of the rotating grinding assembly, has high grinding efficiency, and has consistent size precision after the grinding of the multiple carbon brushes, thereby improving the stability of the operation of the yaw slip ring.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and in particular to a carbon brush grinding device for a yaw collector ring. Background Technology

[0002] With the continuous development of wind power generation systems in my country, the market for wind turbines is gradually maturing, and the reliability requirements for yaw collector rings are becoming increasingly stringent. Due to the unique operating conditions of yaw collector rings, carbon brushes cannot be ground in the same way as pre-grinding carbon brushes in generator sets. Conventional sandpaper grinding and long-term operation wear are not feasible. However, poor contact between the carbon brush and the slip ring can lead to poor current distribution in the collector ring, excessive local temperature rise, frequent unit failures, and the risk of electrolytic corrosion. Therefore, it is necessary to perform arc pre-grinding on the carbon brushes of the yaw collector ring. However, existing grinding equipment for yaw collector ring carbon brushes suffers from low grinding efficiency and large precision deviations among multiple carbon brushes on the same collector ring after grinding. Summary of the Invention

[0003] The purpose of this invention is to provide a carbon brush grinding device for yaw slip rings. This addresses the problems of low grinding efficiency and large precision deviations among multiple carbon brushes on the same slip ring after grinding in existing technologies.

[0004] A carbon brush grinding device for a yaw slip ring includes a support frame, a rotary grinding assembly mounted on the support frame, and a carbon brush mounting assembly mounted on the support frame.

[0005] The carbon brush mounting assembly includes a support ring, the central axis of which coincides with the rotation axis of the rotary grinding assembly. The support ring is equipped with a plurality of limiting mechanisms for mounting the carbon brush to be ground, and the plurality of limiting mechanisms are arranged in an angular array along the central axis of the support ring.

[0006] Optionally, the rotary grinding assembly includes a rotary motor mounted on the lower end face of the top mounting plate of the support frame, and a simulated slip ring is provided on the upper end face of the top mounting plate, the simulated slip ring being located inside the support ring;

[0007] The power output shaft of the rotary motor passes through the top mounting plate, and a drive shaft is mounted on the bottom end of the simulated slip ring. The power output shaft of the rotary motor and the drive shaft are connected by a coupling. The drive shaft, the simulated slip ring, and the power output shaft of the rotary motor are all coaxially arranged.

[0008] Optionally, the simulated slip ring is fabricated using an electroplated fine steel grit process for the external abrasive layer.

[0009] Optionally, the limiting mechanism includes a brush box mounted on the support ring, wherein both sides of the brush box along the radial direction of the support ring are open;

[0010] The carbon brush to be polished is embedded in the brush box. A flexible quick-release module is also installed on the support ring on one side of the brush box. The front end of the flexible quick-release module extends into the brush box to provide elastic support for the carbon brush.

[0011] Optionally, the elastic quick-release module includes an L-shaped fixing plate mounted on the support ring. A top rod is mounted on one end of the L-shaped fixing plate near the axis of the support ring. A T-shaped top block is connected to the front end of the top rod. A pressure sensor is mounted on the front end of the T-shaped top block. A compression spring for elastically supporting the carbon brush is mounted on the front end of the pressure sensor. The compression spring is located inside the brush box.

[0012] A positioning pin is also installed on the front end face of the T-shaped top block, and a positioning pin hole that cooperates with the positioning pin is provided on the end face of the brush box away from the axis of the support ring.

[0013] Optionally, the lower end face of the support ring is further provided with a plurality of insulating support columns for supporting the support ring. The axis of the insulating support column is arranged in the vertical direction, and the lower end of the insulating support column is mounted on the top mounting plate.

[0014] Optionally, the brush box is provided with mounting ears on both sides of the side wall perpendicular to the radius of the support ring, and the brush box is locked to the support ring by the mounting ears.

[0015] Optionally, a rectangular positioning block is provided at the lower end of the brush box, and a rectangular positioning groove that cooperates with the rectangular positioning block is provided on the inner side wall of the support ring.

[0016] Optionally, it also includes a host computer, the pressure sensor and the host computer communicate with each other, the host computer includes a data acquisition module, a parameter calculation module, a judgment module and a control module;

[0017] The input end of the data acquisition module communicates with the pressure sensor, and the output end of the data acquisition module communicates with the input end of the parameter calculation module. The parameter calculation module is used to calculate the pressure deviation value of several pressure sensors on the support ring based on the acquired pressure value.

[0018] The judgment module communicates with the parameter calculation module and the control module. The judgment module is used to determine whether the carbon brush grinding is completed based on the collected pressure value and pressure deviation value. The control module is used to control the start and stop of the rotary grinding component.

[0019] Optionally, the specific steps for the judgment module to determine whether the carbon brush grinding is complete based on the collected pressure value and pressure change, and to control the start and stop of the rotary grinding assembly through the control module, are as follows:

[0020] S1: The data acquisition module acquires the pressure P from the pressure sensor at time intervals of Δt. i j And it is sent to the parameter calculation module, where: P i j This represents the pressure value at the i-th sampling time of the j-th pressure sensor;

[0021] S2: The parameter calculation module calculates the pressure value P based on the collected pressure value. i j Calculate the pressure deviation value ΔP i j :

[0022] △P i j =|P i j -P m |

[0023] In the formula, P m ΔP is the preset pressure threshold. i j This represents the pressure deviation value during the i-th sampling of the j-th pressure sensor;

[0024] S3: The judgment module determines the pressure deviation value △P based on the pressure deviation value. i j Determine if the carbon brushing is complete:

[0025] If the N pressure deviation values ​​ΔP from the g-th sample to the k-th sample are... i j All satisfy △P i j ≤△P m If the carbon brush brushing is complete, then the brushing process is considered finished; otherwise, the brushing process is considered incomplete. Where: i∈[g~k], j∈N, where N is the number of pressure sensors on the support ring, ΔP m The preset pressure deviation threshold is T, which is the time required for the rotary polishing component to rotate one revolution.

[0026] S4: If it is determined that the carbon brush grinding is completed, the control module controls the rotary grinding component to stop grinding; if it is determined that the carbon brush grinding is not completed, the control module controls the rotary grinding component to continue grinding the carbon brush.

[0027] Because of the adoption of the above technical solution, the present invention has the following advantages:

[0028] 1. This application sets multiple sets of limiting mechanisms on the support ring to install multiple carbon brushes. During the rotation of the rotary grinding component, multiple carbon brushes are ground simultaneously, resulting in high grinding efficiency. At the same time, the dimensional accuracy of multiple carbon brushes is consistent after grinding, which improves the stability of the yaw collector ring operation.

[0029] 2. This application monitors the brushing pressure between the carbon brush and the simulated slip ring by setting a pressure sensor, and evaluates the degree of carbon brush wear by the pressure deviation value, thereby realizing automated carbon brush wear and improving the efficiency of carbon brush wear.

[0030] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained from the following description and claims. Attached Figure Description

[0031] The accompanying drawings of this invention are described below.

[0032] Figure 1 This is a schematic diagram of the carbon brush grinding device of the present invention.

[0033] Figure 2 This is a front view of the carbon brush grinding device of the present invention.

[0034] Figure 3 This is a schematic diagram of the limiting mechanism of the present invention.

[0035] Figure 4 This is a schematic diagram of the brush box, pressure sensor, and compression spring of the present invention.

[0036] Figure 5 This is a schematic diagram of the structure of the flexible quick-release module of the present invention.

[0037] Figure 6 This is a schematic diagram of the carbon brush and brush holder of the present invention.

[0038] In the diagram: 1-Support frame; 2-Support ring; 3-Carbon brush; 4-Rotating motor; 5-Simulated slip ring; 6-Drive shaft; 7-Coupling; 8-Brush box; 9-L-shaped fixing plate; 10-Top rod; 11-T-shaped top block; 12-Pressure sensor; 13-Compression spring; 14-Positioning pin; 15-Positioning pin hole; 16-Insulating support column; 17-Mounting lug; 18-Rectangular positioning block; 101-Top mounting plate. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] Example:

[0041] like Figure 1 and Figure 2 The carbon brush grinding device for a yaw slip ring is characterized by comprising a support frame 1, a rotary grinding assembly mounted on the support frame 1, and a carbon brush mounting assembly mounted on the support frame 1.

[0042] The carbon brush mounting assembly includes a support ring 2, the central axis of which coincides with the rotation axis of the rotary grinding assembly. The support ring 2 is equipped with a plurality of limiting mechanisms for mounting the carbon brushes 3 to be ground, and the plurality of limiting mechanisms are arranged in an angular array along the central axis of the support ring 2.

[0043] In this embodiment, before grinding, a carbon brush 3 is set in each of the multiple limiting mechanisms. The rotating grinding assembly is started to grind the multiple carbon brushes 3 simultaneously, resulting in high grinding efficiency. After grinding, the multiple carbon brushes 3 have consistent dimensional accuracy and high coaxiality. During use, the multiple carbon brushes 3 are ground to the same degree as the conductive ring of the yaw collector ring, so the yaw collector ring will not be unstable due to inconsistent grinding of a single carbon brush 3. This reduces the maintenance frequency of the yaw collector ring and improves the stability of the yaw collector ring operation.

[0044] like Figure 1 and Figure 2 As shown, the rotary grinding assembly includes a rotary motor 4 mounted on the lower end face of the top mounting plate 101 of the support frame 1. A simulated slip ring 5 is provided on the upper end face of the top mounting plate 101, and the simulated slip ring 5 is located inside the support ring 2.

[0045] The power output shaft of the rotary motor 4 passes through the top mounting plate 101. The bottom end of the simulated slip ring 5 is equipped with a drive shaft 6. The power output shaft of the rotary motor 4 and the drive shaft 6 are connected by a coupling 7. The drive shaft 6, the simulated slip ring 5 and the power output shaft of the rotary motor 4 are all coaxial.

[0046] In this embodiment, the simulated slip ring 5 is manufactured with an external abrasive layer made of 304 electroplated high-precision steel grit, which increases the wear resistance and service life of the slip ring, while ensuring more precise brush dimensions and higher coverage. During the abrasive process, the rotary motor 4 drives the simulated slip ring 5 to rotate at a low speed, and the electroplated high-precision steel grit grinds the carbon brush 3.

[0047] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the limiting mechanism includes a brush box 8 installed on the support ring 2, and both sides of the brush box 8 along the radial direction of the support ring 2 are open.

[0048] The carbon brush 3 to be brushed is embedded in the brush box 8. A flexible quick-release module is also installed on the support ring 2 on one side of the brush box 8. The front end of the flexible quick-release module extends into the brush box 8 to provide elastic support for the carbon brush 3.

[0049] In this embodiment, the carbon brush 3 is slidably disposed in the brush box 8. The carbon brush 3 is elastically supported by the elastic quick-release module, so that the front end of the carbon brush 3 abuts against the end face of the simulated slip ring 5, which facilitates the brushing of the carbon brush 3.

[0050] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the elastic quick-release module includes an L-shaped fixing plate 9 mounted on the support ring 2. A top rod 10 is mounted on one end of the L-shaped fixing plate 9 near the axis of the support ring 2. A T-shaped top block 11 is connected to the front end of the top rod 10. A pressure sensor 12 is mounted on the front end of the T-shaped top block 11. A compression spring 13 for elastically supporting the carbon brush 3 is mounted on the front end of the pressure sensor 12. The compression spring 13 is located inside the brush box 8.

[0051] A positioning pin 14 is also installed on the front end face of the T-shaped top block 11, and a positioning pin hole 15 that cooperates with the positioning pin 14 is provided on the end face of the brush box 8 away from the axis of the support ring 2.

[0052] In this embodiment, before brushing, the elastic quick-release module is disassembled, the carbon brush 3 is placed in the brush box 8, and then the elastic quick-release module is installed on the support ring 2. During installation, when the two sides of the front face of the T-shaped top block 11 abut against the rear side of the brush box 8, the L-shaped fixing plate 9 is then locked onto the support ring 2 with screws, and the installation is completed.

[0053] like Figure 1 and Figure 2 As shown, the lower end face of the support ring 2 is also equipped with a plurality of insulating support columns 16 for supporting the support ring 2. The axis of the insulating support column 16 is arranged in the vertical direction, and the lower end of the insulating support column 16 is installed on the top mounting plate 101.

[0054] In this embodiment, there are four insulating support columns 16. With the support of the insulating support columns 16, the front end face of the carbon brush 3 can be located on the same horizontal plane as the grinding end face of the simulated slip ring 5, which facilitates the grinding of the carbon brush 3.

[0055] like Figure 3 , Figure 4 and Figure 6 As shown, the brush box 8 is provided with mounting ears 17 on both sides of the support ring 2 in the direction perpendicular to the radius of the support ring 2, and the brush box 8 is locked to the support ring 2 by the mounting ears 17.

[0056] like Figure 3 , Figure 4 and Figure 6 As shown, a rectangular positioning block 18 is provided at the lower end of the brush box 8, and a rectangular positioning groove that cooperates with the rectangular positioning block 18 is provided on the inner side wall of the support ring 2.

[0057] In this embodiment, when installing the brush box 8, the rectangular positioning block 18 is inserted into the rectangular positioning groove for positioning, and then the mounting lug 17 is locked onto the support ring 2 by screws to realize the installation of the brush box 8. After the brush box 8 is debugged and installed, it can be used until the next calibration and debugging.

[0058] As an embodiment of the present invention, it also includes a host computer, wherein the pressure sensor 12 communicates with the host computer, and the host computer includes a data acquisition module, a parameter calculation module, a judgment module and a control module.

[0059] The input end of the data acquisition module communicates with the pressure sensor 12, and the output end of the data acquisition module communicates with the input end of the parameter calculation module. The parameter calculation module is used to calculate the pressure deviation value of several pressure sensors 12 on the support ring 2 based on the acquired pressure value.

[0060] The judgment module communicates with the parameter calculation module and the control module. The judgment module is used to determine whether the carbon brush grinding is completed based on the collected pressure value and pressure deviation value. The control module is used to control the start and stop of the rotary grinding component.

[0061] As an embodiment of the present invention, the specific steps of the judgment module determining whether the carbon brush grinding is completed based on the collected pressure value and pressure change, and controlling the start and stop of the rotary grinding assembly through the control module are as follows:

[0062] S1: The data acquisition module acquires the pressure P of pressure sensor 12 at time intervals of Δt. i j And it is sent to the parameter calculation module, where: P i j This represents the pressure value of the j-th pressure sensor 12 during its i-th sampling.

[0063] S2: The parameter calculation module calculates the pressure value P based on the collected pressure value. i j Calculate the pressure deviation value ΔP i j :

[0064]

[0065] In the formula, P m ΔP is the preset pressure threshold. ij This represents the pressure deviation value of the j-th pressure sensor 12 during the i-th sampling.

[0066] S3: The judgment module determines the pressure deviation value △P based on the pressure deviation value. i j Determine if the carbon brushing is complete:

[0067] If the N pressure deviation values ​​ΔP from the g-th sample to the k-th sample are... i j All satisfy △P i j ≤△P m If the carbon brush brushing is complete, then the brushing process is considered finished; otherwise, the brushing process is considered incomplete. Where: i∈[g~k], j∈N, N is the number of pressure sensors 12 on support ring 2, ΔP m The preset pressure deviation threshold is T, which is the time required for the rotary polishing component to rotate one revolution.

[0068] S4: If it is determined that the carbon brush grinding is completed, the control module controls the rotary grinding component to stop grinding; if it is determined that the carbon brush grinding is not completed, the control module controls the rotary grinding component to continue grinding the carbon brush.

[0069] In this embodiment, when the simulated slip ring 5 rotates one revolution or more, if all pressure deviation values ​​of a single pressure sensor 12 within that time period are less than a preset pressure deviation threshold, it indicates that the carbon brush 3 has reached the predetermined accuracy and stable operating conditions. When all pressure sensors 12 simultaneously meet the above conditions, it indicates that the grinding of this batch of carbon brushes 3 is complete. This application monitors the grinding pressure between the carbon brush 3 and the simulated slip ring 5 using pressure sensors 12, and evaluates the degree of grinding of the carbon brush 3 through the pressure deviation value, thereby realizing automated grinding of the carbon brush 3 and improving the efficiency of carbon brush grinding.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A carbon brush grinding device for a yaw slip ring, characterized in that, It includes a support frame (1), a rotary grinding assembly mounted on the support frame (1), and a carbon brush mounting assembly mounted on the support frame (1); The carbon brush mounting assembly includes a support ring (2), the central axis of which coincides with the rotation axis of the rotary grinding assembly. The support ring (2) is equipped with a plurality of limiting mechanisms for mounting the carbon brush (3) to be ground. The plurality of limiting mechanisms are arranged in an equiangular array along the central axis of the support ring (2). The limiting mechanism includes a brush box (8) installed on the support ring (2). Both sides of the brush box (8) along the radial direction of the support ring (2) are open. The carbon brush (3) to be brushed is embedded in the brush box (8). An elastic quick-release module is also installed on the support ring (2) on one side of the brush box (8). The front end of the elastic quick-release module extends into the brush box (8) to provide elastic support for the carbon brush (3). The elastic quick-release module includes an L-shaped fixing plate (9) installed on the support ring (2). A top rod (10) is installed at one end of the L-shaped fixing plate (9) near the axis of the support ring (2). A T-shaped top block (11) is connected to the front end of the top rod (10). A pressure sensor (12) is installed at the front end of the T-shaped top block (11). A compression spring (13) for elastic support of the carbon brush (3) is installed at the front end of the pressure sensor (12). The compression spring (13) is located inside the brush box (8).

2. The carbon brush grinding device for a yaw slip ring according to claim 1, characterized in that, The rotary grinding assembly includes a rotary motor (4) mounted on the lower end face of the top mounting plate (101) of the support frame (1), and a simulated slip ring (5) is provided on the upper end face of the top mounting plate (101), which is located inside the support ring (2). The power output shaft of the rotary motor (4) passes through the top mounting plate (101), and the drive shaft (6) is installed at the bottom of the simulated slip ring (5). The power output shaft of the rotary motor (4) and the drive shaft (6) are connected by a coupling (7). The drive shaft (6), the simulated slip ring (5) and the power output shaft of the rotary motor (4) are all coaxial.

3. The carbon brush grinding device for a yaw slip ring according to claim 2, characterized in that, The simulated slip ring (5) is made with an external abrasive layer using 304 electroplated fine steel sand process.

4. The carbon brush grinding device for a yaw slip ring according to claim 1, characterized in that, A positioning pin (14) is also installed on the front end face of the T-shaped top block (11), and a positioning pin hole (15) that cooperates with the positioning pin (14) is provided on the end face of the brush box (8) away from the axis of the support ring (2).

5. The carbon brush grinding device for a yaw slip ring according to claim 2, characterized in that, The lower end face of the support ring (2) is also equipped with a plurality of insulating support columns (16) for supporting the support ring (2). The axis of the insulating support column (16) is arranged in the vertical direction, and the lower end of the insulating support column (16) is installed on the top mounting plate (101).

6. The carbon brush grinding device for a yaw slip ring according to claim 1, characterized in that, The brush box (8) is provided with mounting ears (17) on both sides of the support ring (2) in the direction perpendicular to the radius. The brush box (8) is locked to the support ring (2) by the mounting ears (17).

7. The carbon brush grinding device for a yaw slip ring according to claim 1, characterized in that, The lower end of the brush box (8) is provided with a rectangular positioning block (18), and the inner side wall of the support ring (2) is provided with a rectangular positioning groove that cooperates with the rectangular positioning block (18).

8. The carbon brush grinding device for a yaw slip ring according to claim 1, characterized in that, It also includes a host computer, and the pressure sensor (12) communicates with the host computer. The host computer includes a data acquisition module, a parameter calculation module, a judgment module and a control module. The input end of the data acquisition module communicates with the pressure sensor (12), and the output end of the data acquisition module communicates with the input end of the parameter calculation module. The parameter calculation module is used to calculate the pressure deviation value of several pressure sensors (12) on the support ring (2) based on the acquired pressure value. The judgment module communicates with the parameter calculation module and the control module. The judgment module is used to determine whether the carbon brush grinding is completed based on the collected pressure value and pressure deviation value. The control module is used to control the start and stop of the rotary grinding component.

9. The carbon brush grinding device for a yaw slip ring according to claim 8, characterized in that, The judgment module determines whether the carbon brush grinding is complete based on the collected pressure value and pressure change, and the control module controls the start and stop of the rotary grinding assembly. The specific steps are as follows: S1: Data acquisition module The pressure of the pressure sensor (12) is collected at time intervals. And it is sent to the parameter calculation module, where: For the first The pressure sensor (12) Pressure value at the time of the next sampling; S2: The parameter calculation module calculates the pressure values ​​collected. Calculate pressure deviation value : ， In the formula, The preset pressure threshold, For the first The pressure sensor (12) Pressure deviation value at the time of the next sampling; S3: The judgment module determines the pressure deviation value. Determine if the carbon brushing is complete: If the first The second sample to the first Secondary sampling pressure deviation value All meet If the carbon brush brushing is complete, then the brushing process is considered finished; otherwise, the brushing process is considered incomplete. , , , To support the number of pressure sensors (12) on the ring (2), The preset pressure deviation threshold, The time required for the rotary polishing assembly to complete one revolution; S4: If it is determined that the carbon brush grinding is completed, the control module controls the rotary grinding component to stop grinding; if it is determined that the carbon brush grinding is not completed, the control module controls the rotary grinding component to continue grinding the carbon brush.

Images