Power generator carbon brush grinding device

Abstract

The invention relates to a generator carbon brush grinding device which comprises a base and a brush carrier, a grinding cylinder with the same outer diameter as a generator slip ring is rotationally arranged above the base, an annular guide rail is arranged on one side of the grinding cylinder, and the center line of the annular guide rail coincides with the axis of the grinding cylinder; the diameter of the annular guide rail is larger than that of the grinding cylinder, one end of the brush frame is arranged on the annular guide rail in a sliding mode, a fine adjustment assembly is further arranged on the brush frame, the brush frame is connected with a carbon brush holder, and the carbon brush holder is used for installing a carbon brush to be ground. The problem that the contact surface of the generator carbon brush in daily maintenance is less than 80% can be solved.

Description

Technical Field

[0001] The invention relates to a generator carbon brush grinding device, belonging to the technical field of generator carbon brushes. Background Art

[0002] Generator carbon brushes need to be replaced regularly to ensure the safety of the generator due to wear and tear during use. According to the "Twenty-five Key Requirements for Preventing Power Production Accidents", the contact area between the carbon brush and the slip ring must be no less than 80% to avoid the increase in contact resistance between the carbon brush and the slip ring due to a small contact area, which will cause the slip ring contact surface to heat up and cause the slip ring temperature to gradually increase, eventually causing the generator slip ring to burn out.

[0003] Therefore, each running generator must have a set of ground carbon brushes as a daily maintenance item for the long-term safe and stable operation of the generator. When the generator is stopped, the carbon brushes are usually ground with sandpaper on the slip ring surface. Not only is the space small and inconvenient to operate, but the grinding time is long and the grinding efficiency is low. When the sandpaper is operated, due to the force of the sandpaper, when the spare carbon brush is ground near the operating part, the arc of the contact area is somewhat different from the slip ring, which cannot meet the requirement of not less than 80%.

[0004] Chinese patent CN216991261U discloses a generator carbon brush grinding device, including a base and a brush holder, a grinding cylinder with the same outer diameter as the generator slip ring is rotatably arranged above the base, a first annular guide rail and a second annular guide rail are concentrically arranged at both ends of the grinding cylinder, the center lines of the first annular guide rail and the second annular guide rail coincide with the axis of the grinding cylinder, the diameters of the first annular guide rail and the second annular guide rail are both larger than the diameter of the grinding cylinder, and the diameter of the second annular guide rail is larger than the diameter of the first annular guide rail; one end of the brush holder is slidably arranged between the first annular guide rail and the second annular guide rail at one end of the grinding cylinder, and the other end of the brush holder is slidably arranged between the first annular guide rail and the second annular guide rail at the other end of the grinding cylinder, a carbon brush holder is connected to the brush holder, and the carbon brush holder is used to install the carbon brush to be ground, but the carbon brush cannot be fitted to a high degree only by sliding the brush holder between the first annular guide rail and the second annular guide rail, and there are problems such as errors caused by slight vibrations when locking the brush holder. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a generator carbon brush grinding device, which can quickly grind the carbon brush and solve the problem that the contact surface is less than 80% in the daily maintenance of the generator carbon brush.

[0006] The technical solution of the present invention is as follows:

[0007] A generator carbon brush grinding device comprises a base and a brush holder, wherein a grinding cylinder with the same outer diameter as the generator slip ring is rotatably arranged above the base, an annular guide rail is arranged on one side of the grinding cylinder, the center line of the annular guide rail coincides with the axis line of the grinding cylinder, the diameter of the annular guide rail is larger than the diameter of the grinding cylinder, one end of the brush holder is slidably arranged on the annular guide rail, a fine-tuning assembly is also arranged on the brush holder, a carbon brush holder is connected to the brush holder, and the carbon brush holder is used to install the carbon brush to be ground.

[0008] Wherein, an annular slideway is provided in the middle of the inner arc surface and the outer arc surface of the annular guide rail; and the brush holder is slidably connected to the annular guide rail via a sliding assembly.

[0009] Wherein, the sliding assembly includes a fixed plate arranged on the side wall of the brush frame, and four pulleys are arranged on the side of the fixed plate away from the brush frame. The four pulleys are grouped in pairs, and the two pulleys in each group are respectively slidably clamped on the annular slideways on both sides.

[0010] Among them, the fine-tuning component includes two rotating disks fixedly arranged on the side wall of the brush holder, and the sliding component is arranged on the rotating disk away from one end of the brush holder; two arc grooves are symmetrically arranged on the two rotating disks, and the arc lines of the two arc grooves are bent toward the center of the rotating disk; a screw is passed through the arc grooves of the two rotating disks, and the two rotating disks are connected by a screw and a nut.

[0011] The invention also includes a fixing rod, the two ends of which are respectively located on the upper and lower sides of the annular guide rail; and the two ends of the fixing rod are fixed on the rotating disc by bolts.

[0012] Among them, two platforms are arranged on the base, and the grinding cylinder and the annular guide rail are both located on the upper platform; a rotating motor is arranged on the lower platform, and gears are arranged on the ends of the grinding cylinder and the rotating motor, and the two gears are connected by a toothed belt drive.

[0013] Wherein, a rotating handle is installed at the other end of the grinding cylinder.

[0014] Wherein, the carbon brush comprises a carbon brush holder, the inner wall of the carbon brush holder is connected with a spring, the other end of the spring is provided with a fixing frame, and one end of the carbon brush is fixedly connected to the inside of the fixing frame.

[0015] The side wall of the fixed frame is fitted with the inner side wall of the carbon brush holder; the fixed frame comprises an outer frame and an elastic inner frame, the elastic inner frame is fitted with the carbon brush, and the space between the elastic inner frame and the outer frame is filled with electrorheological fluid.

[0016] Wherein, a telescopic rod is arranged on the inner wall of the carbon brush bracket, the spring is sleeved on the outside of the telescopic rod, and the end surface of the telescopic rod is fixedly connected to the top of the fixing frame.

[0017] The present invention has the following beneficial effects:

[0018] The present invention sets an annular guide rail. When in use, the carbon brush to be replaced is installed on the carbon brush holder, and the brush holder is enabled to slide on the annular guide rail. When the brush slides to the position where the arc of the contact surface of the carbon brush and the grinding cylinder is consistent, the rough adjustment of the grinding of the carbon brush is completed; then, the fine adjustment component is used to make the rotating disk therein rotate circumferentially, and the adjustment is performed again. The carbon brush can be quickly ground by rotating the grinding cylinder to obtain a spare carbon brush with the same arc as the carbon brush to be replaced. The present invention can solve the problem that the contact surface is less than 80% in the daily maintenance of the generator carbon brush, and can quickly and accurately grind out spare carbon brushes with qualified arcs in all different positions, so that the condition of replacement at any time is met, and better guarantee is provided for the safe and stable operation of the generator set;

[0019] The present invention also utilizes the characteristics of electrorheological fluid to enable the carbon brush to have a certain degree of self-adaptation during adjustment, so that the carbon brush can fit the grinding cylinder at a more accurate angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the overall structure of the present invention;

[0021] Figure 2 It is a side view of the overall structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the fine-tuning component of the present invention;

[0023] Figure 4 It is a half-section view of the carbon brush of the present invention.

[0024] The reference numerals in the figure represent:

[0025] 1. Base; 2. Brush holder; 3. Grinding cylinder; 4. Annular guide rail; 5. Carbon brush holder; 6. Carbon brush; 7. Fixed plate; 8. Pulley; 9. Rotating disc; 10. Arc groove; 11. Fixed rod; 12. Bolt; 13. Platform; 14. Rotating motor; 15. Gear; 16. Toothed belt; 17. Rotating handle; 18. Carbon brush holder; 19. Spring; 20. Fixed frame; 21. Telescopic rod; 22. Electrorheological fluid. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figures 1 to 4 , the invention provides a technical solution:

[0028] A generator carbon brush grinding device comprises a base 1 and a brush holder 2. A grinding cylinder 3 having the same outer diameter as the generator slip ring is rotatably arranged above the base 1. An annular guide rail 4 is arranged on one side of the grinding cylinder 3. The center line of the annular guide rail 4 coincides with the axis of the grinding cylinder 3. The diameter of the annular guide rail 4 is larger than the diameter of the grinding cylinder 3. One end of the brush holder 2 is slidably arranged on the annular guide rail 4. The brush holder 2 is also provided with a fine-tuning component. A carbon brush holder 5 is connected to the brush holder 2. The carbon brush holder 5 is used to install a carbon brush 6 to be ground.

[0029] Hold the carbon brush holder 5 and slide the brush holder 2 along the annular guide rail 4 until the bottom surface of the carbon brush 6 is in a relatively close fit with the grinding cylinder 3. Then fine-tune it through the fine-tuning component, and quickly grind the carbon brush 6 by rotating the grinding cylinder 3.

[0030] Specifically, an annular slideway is provided at the middle of the inner and outer arc surfaces of the annular guide rail 4; the brush holder 2 is slidably connected to the annular guide rail 4 through a sliding assembly, the sliding assembly includes a fixed plate 7 arranged on the side wall of the brush holder 2, and four pulleys 8 are arranged on the side of the fixed plate 7 away from the brush holder 2, the four pulleys 8 are grouped in pairs, and the two pulleys 8 of each group are respectively slidably clamped on the annular slideways on both sides; the pulley 8 can slide in the annular slideway;

[0031] The fine-tuning assembly includes two rotating discs 9 fixedly arranged on the side wall of the brush holder 2, and the sliding assembly is arranged on the rotating disc 9 at one end away from the brush holder 2; two arc grooves 10 are symmetrically arranged on the two rotating discs 9, and the arc lines of the two arc grooves 10 are bent toward the center of the rotating disc 9; screws are inserted into the arc grooves 10 of the two rotating discs 9, and the two rotating discs 9 are connected by the screws and nuts; by adjusting the loose nuts, the two rotating discs 9 can rotate relative to each other, and because the screws are inserted in the arc grooves 10 of the two rotating discs 9, the two rotating discs 9 can rotate a certain distance;

[0032] At the same time, it also includes a fixing rod 11, the two ends of the fixing rod 11 are respectively located on the upper and lower sides of the annular guide rail 4; and the two ends of the fixing rod 11 are fixed on the rotating disc 9 by bolts 12; when the bolts 12 are locked, the brush holder 2 can be driven to slide through the pulley 8, and when the brush holder 2 slides to a suitable position, the bolts 12 are screwed and tightened on the rotating disc 9, so that the brush holder 10 can be fixed.

[0033] After the pulley 8 slides in the annular slide for coarse adjustment, the brush holder 2 is rotated again by holding the carbon brush holder 5. Since the rotating disc 9 is clamped by the fixed rod 11, and then the nut is adjusted and loosened, the rotating disc 9 away from the fixed rod 11 can be rotated. At this time, the brush holder 5 is held to rotate the brush holder 2 relative to the center of the rotating disc 9 for fine adjustment until it is rotated to the appropriate position, and then the nut is tightened to drive the grinding cylinder 3 to rotate, thereby quickly grinding the carbon brush 6.

[0034] The base 1 is provided with two platforms 13, the grinding cylinder 3 and the annular guide rail 4 are both located on the upper platform 13; a rotating motor 14 is provided on the lower platform 13, the grinding cylinder 3 and the rotating motor 14 are both provided with gears 15 at the ends, and the two gears 15 are connected by a toothed belt 16; a rotating handle 17 is installed at the other end of the grinding cylinder 3; when the rotating motor 14 fails or is accidentally damaged, it can be manually rotated by rotating the handle 17;

[0035] As a preference, the carbon brush 6 includes a carbon brush holder 18 , an inner wall of the carbon brush holder 18 is connected to a spring 19 , a fixing frame 20 is provided at the other end of the spring 19 , and one end of the carbon brush 6 is fixedly connected to the inside of the fixing frame 20 .

[0036] The side wall surface of the fixed frame 20 is arranged to fit the inner side wall surface of the carbon brush holder 18; the fixed frame 20 includes an outer frame and an elastic inner frame, the elastic inner frame is arranged to fit the carbon brush 6, and the space between the elastic inner frame and the outer frame is filled with an electrorheological fluid 22; it also includes an activation device, the activation device provides an activation signal for the electrorheological fluid 22, the electrorheological fluid 22 is an intelligent material that can be transformed from liquid to solid under the action of an external electric field, the carbon brush holder 18 of the existing device is all made of hard material, when the carbon brush 6 needs to be more closely fitted to the grinding cylinder 3, the carbon brush 6 cannot be adaptively adjusted inside the carbon brush holder 18;

[0037] By providing the electrorheological fluid 22, when the adjustment is performed through coarse adjustment and fine adjustment as described above, the carbon brush 6 abuts against the grinding cylinder 3. Since the electrorheological fluid 22 is a liquid under normal conditions, the carbon brush 6 will be adaptively adjusted to a more suitable angle for the grinding cylinder 3. Then, after the above adjustment work is completed, the electrorheological fluid 22 is activated by the activation device to be transformed into a solid, thereby completing the stable clamping of the carbon brush 6.

[0038] The inner wall of the carbon brush bracket 18 is provided with a telescopic rod 21, the spring 19 is sleeved on the outside of the telescopic rod 21, and the end surface of the telescopic rod 21 is fixedly connected to the top of the fixed frame 20;

[0039] The working principle of the above generator carbon brush grinding device is as follows:

[0040] First, install the carbon brush 6 on the brush holder 2, and then loosen the bolts 12 at both ends of the fixing rod 11, so that the pulley 8 can slide in the annular slideway, and the operator slides the brush holder 2 along the annular guide rail 4 by holding the carbon brush handle 5 until the carbon brush 6 is relatively in a state of being in contact with the grinding cylinder 3, and then tightens the bolt 12 again, so that the fixing rod 11 can tightly fit and lock the rotating disc 9 with the annular guide rail 4, and the coarse adjustment is completed; then fine-tune again through the fine-tuning assembly, specifically, loosen the nuts and screws inserted on the two rotating discs 9; the rotating disc 9 away from the fixing rod 11 can be rotated, and at the same time The rotating disk 9 near the fixed rod 11 continues to be fixed due to the locking of the bolt 12. At this time, hold the carbon brush holder 5 again to move the brush holder 2 in a circle along the center of the rotating disk 9, so that the carbon brush 6 is further close to the grinding cylinder 3. At this time, due to the electrorheological fluid 22 inside the fixed frame 20, the carbon brush 6 can be adaptively adjusted to a certain extent. When it is observed with the naked eye that the fit is tight enough, start the electrorheological fluid 22 by activating the device, and then keep the two rotating disks 9 locked by the locking nut to complete the setting, and then drive the grinding cylinder 3 to rotate and grind by rotating the motor 14.

[0041] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A generator carbon brush grinding device, comprising a base (1) and a brush holder (2), characterized in that: A grinding cylinder (3) having the same outer diameter as the generator slip ring is rotatably arranged above the base (1); an annular guide rail (4) is arranged on one side of the grinding cylinder (3); the center line of the annular guide rail (4) coincides with the axis of the grinding cylinder (3); the diameter of the annular guide rail (4) is larger than the diameter of the grinding cylinder (3); one end of the brush holder (2) is slidably arranged on the annular guide rail (4); a fine adjustment component is also arranged on the brush holder (2); a carbon brush holder (5) is connected to the brush holder (2); and the carbon brush holder (5) is used to mount a carbon brush (6) to be ground.

2. A generator carbon brush grinding device as claimed in claim 1, characterized in that: Annular slideways are provided in the middle of the inner and outer arc surfaces of the annular guide rail (4); and the brush holder (2) is slidably connected to the annular guide rail (4) via a sliding assembly.

3. A generator carbon brush grinding device as claimed in claim 2, characterized in that: The sliding assembly comprises a fixed plate (7) arranged on the side wall of the brush holder (2), and four pulleys (8) are arranged on the side of the fixed plate (7) away from the brush holder (2). The four pulleys (8) are arranged in groups of two, and the two pulleys (8) in each group are respectively slidably clamped on the annular slideways on both sides.

4. A generator carbon brush grinding device as claimed in claim 3, characterized in that: The fine adjustment component comprises two rotating disks (9) fixedly arranged on the side wall surface of the brush holder (2); the sliding component is arranged on the rotating disk (9) at one end away from the brush holder (2); two arc grooves (10) are symmetrically arranged on the two rotating disks (9), and the arc lines of the two arc grooves (10) are bent toward the center of the rotating disk (9); screws are inserted into the arc grooves (10) of the two rotating disks (9), and the two rotating disks (9) are connected by screws and nuts.

5. A generator carbon brush grinding device as claimed in claim 4, characterized in that: It also includes a fixing rod (11), the two ends of which are respectively located on the upper and lower sides of the annular guide rail (4); and the two ends of the fixing rod (11) are fixed on the rotating disc (9) by bolts (12).

6. A generator carbon brush grinding device as claimed in claim 5, characterized in that: The base (1) is provided with two layers of platforms (13), the grinding cylinder (3) and the annular guide rail (4) are both located on the upper platform (13); a rotating motor (14) is provided on the lower platform (13), the ends of the grinding cylinder (3) and the rotating motor (14) are both provided with gears (15), and the two gears (15) are connected by a toothed belt (16).

7. A generator carbon brush grinding device as claimed in claim 6, characterized in that: A rotating handle (17) is installed at the other end of the grinding cylinder (3).

8. A generator carbon brush grinding device as claimed in claim 1, characterized in that: The carbon brush (6) comprises a carbon brush holder (18), the inner wall of the carbon brush holder (18) is connected to a spring (19), the other end of the spring (19) is provided with a fixing frame (20), and one end of the carbon brush (6) is fixedly connected to the inside of the fixing frame (20).

9. A generator carbon brush grinding device as claimed in claim 8, characterized in that: The side wall surface of the fixed frame (20) is arranged in contact with the inner side wall surface of the carbon brush bracket (18); the fixed frame (20) comprises an outer frame and an elastic inner frame, the elastic inner frame is arranged in contact with the carbon brush (6), and the space between the elastic inner frame and the outer frame is filled with electrorheological fluid (22).

10. A generator carbon brush grinding device as claimed in claim 9, characterized in that: The inner wall of the carbon brush bracket (18) is provided with a telescopic rod (21), the spring (19) is sleeved on the outside of the telescopic rod (21), and the end surface of the telescopic rod (21) is fixedly connected to the top of the fixed frame (20).

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