Sliding tool for grinding bottom arc of excitation carbon brush of steam turbine generator unit

Abstract

The utility model provides a steam turbine generator unit excitation carbon brush bottom arc polishing sliding tool which comprises a supporting plate and a polishing frame, a grinding material installation assembly is fixedly connected to the upper portion of the supporting plate, an installation plate is inserted into the polishing frame, a plurality of limiting frames are fixedly connected to the interior of the installation plate, carbon brush bodies are fixedly connected to the interiors of the limiting frames, and the carbon brush bodies are fixedly connected to the interiors of the carbon brush bodies. A plurality of limiting sliding grooves are formed in one side of the mounting plate, anti-falling sliding tables are slidably connected to the interiors of the limiting sliding grooves, pressure springs are fixedly connected to the upper portions of the anti-falling sliding tables, and one sides of the pressure springs are attached to the top of the carbon brush body; the abrasive paper fixing table is fixedly connected to the upper portion of the supporting plate, a plurality of carbon brush bodies are fixed through the limiting frame in the mounting plate, when the abrasive paper fixing table is inserted into the polishing frame, the pressure spring is pressed to generate constant downward pressure, the bottoms of the carbon brushes are tightly attached to abrasive paper, polishing is synchronously completed in front-back movement of the frame, bottom arc shapes are consistent, contact surfaces are uniform, and polishing efficiency and precision are improved.

Description

Technical Field

[0001] This utility model relates to the field of excitation carbon brush processing technology, and in particular to a sliding tooling for grinding the bottom arc of excitation carbon brushes for steam turbine generator sets. Background Technology

[0002] The excitation carbon brush of a steam turbine generator set is a key conductive component in the generator excitation system. It is typically made of high-purity graphite or composite materials containing metal powder and is installed on the surface of the generator rotor slip ring (or commutator). It maintains dynamic contact with the rotating components through elastic pressure, transmitting external DC excitation current to the rotor windings to form the magnetic field required for power generation. During grinding, the bottom arc of the carbon brush is usually pre-ground manually to form a precise curvature. However, after manual grinding, the direction of the constant pressure spring on the carbon brush is uncertain. Due to the tolerance of the brush holder's inner hole, the bottom arc angle of the carbon brush may deviate laterally. During the break-in process between the carbon brush and the ring surface, the bottom arc of the carbon brush is prone to forming double or multiple grinding surfaces, leading to increased contact resistance between the carbon brush and the ring surface, significantly uneven distribution of the excitation current, and abnormally high temperature areas in some areas of the carbon brush and brush holder. Therefore, tooling is needed to improve the uniformity of grinding.

[0003] A search revealed a Chinese patent with publication number CN222680479U, which discloses an arc grinding device for a large steam turbine generator excitation carbon brush, including a platform and a support. The platform is located on the upper part of the support and has an opening. A motor is located on the lower part of the platform, and the output shaft of the motor is connected to a disc grinding tool, which passes through the opening. A column is located on one side of the upper part of the platform, and a crossbar is connected to the column.

[0004] To address the issues of low installation efficiency and complex operation in the aforementioned technologies, which only allow for the installation of one excitation carbon brush at a time, a sliding fixture for grinding the bottom arc of the excitation carbon brush in steam turbine generator sets is proposed. Utility Model Content

[0005] In view of this, the present invention aims to provide a sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set, so as to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial option.

[0006] The technical solution of this utility model embodiment is implemented as follows: it includes a support plate and a grinding frame. An abrasive mounting assembly is fixedly connected above the support plate. An mounting plate is inserted inside the grinding frame. Multiple limiting frames are fixedly connected inside the mounting plate. A carbon brush body is fixedly connected inside the limiting frames. Multiple limiting grooves are opened on one side of the mounting plate. An anti-detachment slide is slidably connected inside the limiting groove. A pressure spring is fixedly connected above the anti-detachment slide. One side of the pressure spring is attached to the top of the carbon brush body.

[0007] In some embodiments, the abrasive mounting assembly includes a sandpaper mounting table, sandpaper, and fixing pins. The sandpaper mounting table is fixedly connected to the top of a support plate, the sandpaper is attached to the top of the sandpaper mounting table, and a plurality of fixing pins are fixedly connected to the sandpaper mounting table and the sandpaper.

[0008] In some embodiments, a plurality of side pillars are fixedly connected above the support plate, and two side pillars are connected to a sliding rod.

[0009] In some embodiments, a ball bearing sleeve is slidably connected above the slide rod, and a spring is fixedly connected between one side of the ball bearing sleeve and the side support.

[0010] In some embodiments, sliding brackets are fixedly connected to both sides of the grinding frame, and wear-resistant rings are fixedly connected inside the sliding brackets. The inner side of the wear-resistant rings is slidably connected to one side of the ball bearing sleeve.

[0011] In some embodiments, a positioning ramp is fixedly connected to one side of the mounting plate, a handle is fixedly connected above the positioning ramp, a positioning groove is opened on one side of the sliding bracket, and a positioning bolt is threadedly connected to the bottom of the ball sleeve.

[0012] In some embodiments, dust suction port brackets are fixedly connected to both sides of the support plate, and a limit collar is rotatably connected above the dust suction port brackets.

[0013] In some embodiments, the suction port bracket and the limiting collar are internally clamped to hold the suction port, and a positioning buckle is fixedly connected to one side of the limiting collar. The lower end of the positioning buckle is inserted into a groove on one side of the suction port bracket.

[0014] The present invention has the following advantages due to the adoption of the above technical solution:

[0015] 1. A sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set. Multiple carbon brush bodies are fixed by the limiting frame in the mounting plate. When inserted into the grinding frame, the pressure spring is compressed to generate a constant downward pressure, so that the bottom of the carbon brush is in close contact with the sandpaper. The grinding is completed synchronously as the frame moves back and forth, ensuring that the bottom arc shape is consistent and the contact surface is uniform, thereby improving grinding efficiency and accuracy.

[0016] 2. The sliding fixture for grinding the bottom arc of the excitation carbon brush of the steam turbine generator set uses a sliding platform formed by a sliding rod, a ball bearing sleeve, and a spring. The grinding frame moves smoothly on the balls via wear-resistant rings, reducing frictional resistance, and the spring assists in resetting. This structure reduces component wear, ensures linear motion stability, and extends the service life of the fixture.

[0017] 3. The sliding fixture for grinding the bottom arc of the excitation carbon brush of the steam turbine generator set uses a positioning ramp and a handle to achieve quick alignment of the mounting plate with the positioning groove, and the positioning bolts are locked to prevent shaking; the dust suction port is fixed by a limiting collar and connected to external equipment to absorb the carbon powder generated during grinding in real time, reduce the dust concentration in the working environment, and improve operational safety.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is the main view of the present invention.

[0021] Figure 2 This is a partial structural diagram of the mounting plate of this utility model;

[0022] Figure 3 This is an exploded structural diagram of the present invention;

[0023] Figure 4 This is a structural diagram of the ball bearing sleeve of this utility model;

[0024] Figure 5 This is a structural diagram of the dust suction port bracket of this utility model.

[0025] Figure label:

[0026] 1. Support plate; 2. Sandpaper fixing table; 3. Sandpaper; 4. Fixing pin; 5. Side support column; 6. Slide rod; 7. Grinding frame; 8. Carbon brush body; 9. Mounting plate; 10. Pressure spring; 11. Handle; 12. Limiting frame; 13. Limiting slide groove; 14. Anti-detachment slide table; 15. Positioning ramp; 16. Sliding bracket; 17. Positioning groove; 18. Positioning bolt; 19. Ball bearing sleeve; 20. Spring; 21. Wear-resistant collar; 22. Dust suction port bracket; 23. Limiting collar; 24. Positioning buckle; 25. Dust suction port. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0028] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0029] Example 1:

[0030] like Figure 1-5 As shown, the sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set includes a support plate 1 and a grinding frame 7. An abrasive mounting assembly is fixedly connected to the top of the support plate 1. An mounting plate 9 is inserted inside the grinding frame 7. Multiple limiting frames 12 are fixedly connected inside the mounting plate 9. A carbon brush body 8 is fixedly connected inside the limiting frames 12. Multiple limiting grooves 13 are opened on one side of the mounting plate 9. An anti-detachment slide table 14 is slidably connected inside the limiting grooves 13. A pressure spring 10 is fixedly connected above the anti-detachment slide table 14. One side of the pressure spring 10 is attached to the top of the carbon brush body 8.

[0031] The abrasive mounting assembly includes a sandpaper mounting table 2, sandpaper 3, and fixing pins 4. The sandpaper mounting table 2 is fixedly connected to the support plate 1. The top of the sandpaper mounting table 2 is an arc with an outer diameter of R189.5mm. The sandpaper 3 is attached to the top of the sandpaper mounting table 2. Multiple fixing pins 4 are fixedly connected to the sandpaper mounting table 2 and the sandpaper 3.

[0032] When in use, the carbon brush body 8 can be inserted into the limiting frame 12 in the mounting plate 9 first, and then the mounting plate 9 together with multiple carbon brush bodies 8 can be inserted into the grinding frame 7. Since the carbon brush body 8 is inserted and installed from the bottom of the mounting plate 9, the pressure spring 10 will be squeezed and moved upward during this process. When the pressure spring 10 moves to the top, the pressure spring 10 will exert downward pressure on the carbon brush body 8.

[0033] At this time, the bottom of the carbon brush body 8 will contact the sandpaper 3 and be sanded as the sanding frame 7 moves back and forth. The pressure of the full-load constant pressure spring 10 will make the carbon brush body 8 stick tightly to the sandpaper 3, so as to achieve precise bottom arc running-in of multiple carbon brush bodies 8 at the same time.

[0034] In this embodiment, a ball bearing sleeve 19 is slidably connected above the slide rod 6, and a spring 20 is fixedly connected between one side of the ball bearing sleeve 19 and the side support column 5. Sliding brackets 16 are fixedly connected on both sides of the grinding frame 7, and a wear-resistant collar 21 is fixedly connected inside the sliding bracket 16. The inner side of the wear-resistant collar 21 is slidably connected to one side of the ball bearing sleeve 19.

[0035] The ball bearing sleeve 19 provides a stable sliding platform for the back-and-forth linear movement of the grinding frame 7 in the middle, reducing friction and making the movement smoother. The spring 20 can help the ball bearing sleeve 19 return to its original position, allowing the ball bearing sleeve 19 to stably support the grinding frame 7. The wear-resistant ring 21 is made of high-hardness material, which can reduce wear.

[0036] In this embodiment, a positioning ramp 15 is fixedly connected to one side of the mounting plate 9, a handle 11 is fixedly connected above the positioning ramp 15, a positioning groove 17 is opened on one side of the sliding bracket 16, and a positioning bolt 18 is threadedly connected to the bottom of the ball sleeve 19.

[0037] The mounting plate 9 can be quickly positioned by inserting it into the positioning slot 17 through the positioning ramp 15, and the horizontal handle 11 can be easily pushed and pulled back and forth by the operator for polishing.

[0038] The positioning bolt 18 facilitates pressing and fixing the mounting plate 9 from below, preventing shaking from affecting the grinding effect.

[0039] In this embodiment: When in use, the carbon brush body 8 can be inserted into the limiting frame 12 in the mounting plate 9 first, and then the mounting plate 9 together with multiple carbon brush bodies 8 can be inserted into the grinding frame 7. Since the carbon brush body 8 is inserted and installed from the bottom of the mounting plate 9, the pressure spring 10 will be squeezed and moved upward during this process. When the pressure spring 10 moves to the top, the pressure spring 10 will exert downward pressure on the carbon brush body 8.

[0040] At this time, the bottom of the carbon brush body 8 will contact the sandpaper 3 and be sanded as the sanding frame 7 moves back and forth. The pressure of the full negative constant pressure spring 10 will make the carbon brush body 8 stick tightly to the sandpaper 3, so as to achieve precise bottom arc running of multiple carbon brush bodies 8 at the same time.

[0041] The ball bearing sleeve 19 provides a stable sliding platform for the back-to-back linear movement of the grinding frame 7 in the middle, reducing friction and making the movement smoother. The spring 20 can help the ball bearing sleeve 19 return to its original position, allowing the ball bearing sleeve 19 to stably support the grinding frame 7. The wear-resistant ring 21 is made of high-hardness material, which can reduce wear.

[0042] The mounting plate 9 can be quickly positioned by inserting it into the positioning slot 17 through the positioning ramp 15, and the horizontal handle 11 can be easily pushed and pulled back and forth by the operator for polishing.

[0043] The positioning bolt 18 facilitates pressing and fixing the mounting plate 9 from below, preventing shaking from affecting the grinding effect.

[0044] Example 2:

[0045] The sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set is an improvement upon Embodiment 1, as follows: Figure 1-5 As shown,

[0046] In this embodiment, a suction port bracket 22 is fixedly connected to both sides of the support plate 1, and a limiting collar 23 is rotatably connected above the suction port bracket 22; a suction port 25 is clamped inside the suction port bracket 22 and the limiting collar 23, and a positioning buckle 24 is fixedly connected to one side of the limiting collar 23, with the lower end of the positioning buckle 24 inserted into a groove on one side of the suction port bracket 22.

[0047] The dust suction port bracket 22 is fixed by rotating the upper limiting collar 23. The other end of the dust suction port 25 can be connected to an external dust suction component, so that the carbon powder generated during polishing can be sucked up, making the working environment cleaner and preventing dust from spreading.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set, comprising a support plate (1) and a grinding frame (7), characterized in that: An abrasive mounting assembly is fixedly connected above the support plate (1). A mounting plate (9) is inserted inside the grinding frame (7). Multiple limiting frames (12) are fixedly connected inside the mounting plate (9). A carbon brush body (8) is fixedly connected inside the limiting frames (12). Multiple limiting grooves (13) are opened on one side of the mounting plate (9). An anti-detachment slide table (14) is slidably connected inside the limiting grooves (13). A pressure spring (10) is fixedly connected above the anti-detachment slide table (14). One side of the pressure spring (10) is attached to the top of the carbon brush body (8).

2. The sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set according to claim 1, characterized in that: The abrasive mounting assembly includes a sandpaper fixing table (2), sandpaper (3) and fixing pins (4). The sandpaper fixing table (2) is fixedly connected to the support plate (1) above, the sandpaper (3) is attached to the sandpaper fixing table (2) above, and multiple fixing pins (4) are fixedly connected to the sandpaper fixing table (2) and the sandpaper (3).

3. The sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set according to claim 1, characterized in that: Multiple side pillars (5) are fixedly connected above the support plate (1), and two side pillars (5) are connected to a sliding rod (6).

4. The sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set according to claim 3, characterized in that: A ball bearing sleeve (19) is slidably connected above the slide rod (6), and a spring (20) is fixedly connected between one side of the ball bearing sleeve (19) and the side support (5).

5. The sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set according to claim 1, characterized in that: The grinding frame (7) is fixedly connected to two sides by sliding brackets (16), and wear-resistant rings (21) are fixedly connected inside the sliding brackets (16). The inner side of the wear-resistant rings (21) is slidably connected to the ball side of the ball sleeve (19).

6. The sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set according to claim 1, characterized in that: A positioning ramp (15) is fixedly connected to one side of the mounting plate (9), and a handle (11) is fixedly connected above the positioning ramp (15). A positioning groove (17) is opened on one side of the sliding bracket (16), and a positioning bolt (18) is threadedly connected to the bottom of the ball sleeve (19).

7. The sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set according to claim 1, characterized in that: The support plate (1) is fixedly connected to the dust suction port bracket (22) on both sides, and the dust suction port bracket (22) is rotatably connected to the upper part of the limit collar (23).

8. The sliding fixture for grinding the bottom arc of the excitation carbon brush of a steam turbine generator set according to claim 7, characterized in that: The suction port bracket (22) and the limiting collar (23) hold the suction port (25) inside. A positioning buckle (24) is fixedly connected to one side of the limiting collar (23). The lower end of the positioning buckle (24) is inserted into the groove on one side of the suction port bracket (22).

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