A generator carbon brush grinding device

Abstract

The present application relates to a kind of generator carbon brush grinding device, including base and brush holder, the same grinding cylinder as the outer diameter of generator slip ring is rotationally arranged above the base, one side of the grinding cylinder is provided with annular guide rail, the center line of the annular guide rail coincides with the axis of the grinding cylinder, the diameter of the annular guide rail is greater than the diameter of the grinding cylinder, one end of the brush holder is slidably arranged on the annular guide rail, fine adjustment assembly is also provided on the brush holder, the brush holder is connected with carbon brush brush grip, and the carbon brush brush grip is used to install the carbon brush to be ground, the grinding of carbon brush can be quickly realized, and the problem that contact area is less than 80% in the daily maintenance of generator carbon brush can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to a generator carbon brush grinding device, belonging to the technical field of generator carbon brush. BACKGROUND

[0002] Generator carbon brush needs to be replaced regularly to ensure the safety of the generator due to wear during use, according to the requirements of the Twenty-five Key Requirements for Preventing Electric Power Production Accidents, the contact surface of the carbon brush and the slip ring must be not less than 80%, to avoid the contact surface being too small, which leads to an increase in the contact resistance between the carbon brush and the slip ring, causing the slip ring to heat up and eventually causing the generator slip ring to burn out.

[0003] Therefore, each operating generator must have a set of well-grounded carbon brushes as a daily essential maintenance product for long-term safe and stable operation of the generator. When the generator is shut down, the grinding carbon brush is generally used with sandpaper to grind the spare carbon brush against the slip ring surface, which is not only small in space and inconvenient to operate, but also has a long grinding time and low grinding efficiency. When operating the sandpaper, due to the force acting on the sandpaper, there is a certain gap between the contact area of the spare carbon brush near the operating part and the slip ring, which does not meet the requirement of not less than 80%.

[0004] Chinese patent CN216991261U discloses a generator carbon brush grinding device, which includes a base and a brush holder. The upper part of the base is rotatably provided with a grinding cylinder with the same outer diameter as the generator slip ring. The two ends of the grinding cylinder are concentrically provided with first and second ring-shaped guide rails, the center lines of the first and second ring-shaped guide rails coincide with the axis of the grinding cylinder, the diameters of the first and second ring-shaped guide rails are larger than the diameter of the grinding cylinder, and the diameter of the second ring-shaped guide rail is larger than that of the first ring-shaped guide rail. One end of the brush holder is slidably arranged between the first and second ring-shaped guide rails at one end of the grinding cylinder, the other end of the brush holder is slidably arranged between the first and second ring-shaped guide rails at the other end of the grinding cylinder, and a carbon brush holder is connected to the brush holder for mounting the carbon brush to be ground. However, the contact degree of the carbon brush cannot be improved by simply sliding the brush holder between the first and second ring-shaped guide rails, and there are errors caused by slight vibrations when locking the brush holder. SUMMARY

[0005] To solve the above-mentioned problems existing in the prior art, the present application provides a generator carbon brush grinding device which can quickly grind the carbon brush and solve the problem of contact surface less than 80% in the daily maintenance of the generator carbon brush.

[0006] The technical scheme of the present application is as follows:

[0007] A generator carbon brush grinding device includes 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, an annular guide rail is provided on one side of the grinding cylinder, 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 the diameter of the grinding cylinder, one end of the brush holder is slidably arranged on the annular guide rail, the brush holder is also provided with a fine-tuning assembly, 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] The sliding assembly includes a fixed plate arranged on the side wall of the brush holder, and four pulleys are arranged on the side of the fixed plate away from the brush holder. 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 discs fixedly arranged on the side wall of the brush holder, and the sliding component is arranged on the rotating disc away from one end of the brush holder; two arc-shaped grooves are symmetrically arranged on the two rotating discs, and the arc lines of the two arc-shaped grooves are bent toward the center of the rotating disc; a screw is passed through the arc grooves of the two rotating discs, and the two rotating discs are connected by a screw and a nut.

[0011] The invention further comprises 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 set on the base, and the grinding cylinder and the annular guide rail are both located on the upper platform; a rotating motor is set on the lower platform, and gears are set at the ends of the grinding cylinder and the rotating motor, and the two gears are connected by a toothed belt transmission.

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

[0014] The carbon brush includes a carbon brush holder, an inner wall of the carbon brush holder is connected to a spring, a fixing frame is provided at the other end of the spring, and one end of the carbon brush is fixed inside the fixing frame.

[0015] The side wall of the fixing frame is fitted with the inner side wall of the carbon brush holder; the fixing frame includes 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 provided on the inner wall of the carbon brush holder, 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 provides an annular guide rail. When in use, the carbon brush that needs to be replaced is installed on the carbon brush holder, and the brush holder is able to slide on the annular guide rail. When it slides to a position where the curvature of the contact surface of the carbon brush and the grinding cylinder is consistent, the coarse adjustment of the carbon brush grinding is completed. Then, the fine adjustment component is used to enable the rotating disk therein to rotate circumferentially, and 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 curvature as the carbon brush that needs to be replaced. The present invention can solve the problem of the contact surface being less than 80% in the daily maintenance of the generator carbon brush, and can quickly and accurately grind out spare carbon brushes with qualified curvatures in all different positions, so that the spare carbon brushes can be replaced at any time, providing better protection 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 This 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 figures are as follows:

[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 includes a base 1 and a brush holder 2. A grinding cylinder 3 with the same outer diameter as the generator slip ring is rotatably arranged above the base 1. An annular guide rail 4 is provided 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, and 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 the carbon brush 6 can be quickly ground by rotating the grinding cylinder 3.

[0030] Specifically, an annular slide is provided in 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, and the sliding assembly includes a fixed plate 7 provided on the side wall of the brush holder 2, and four pulleys 8 are provided 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 in each group are respectively slidably clamped on the annular slides on both sides; sliding in the annular slide can be achieved through the pulleys 8;

[0031] The fine-tuning assembly includes two rotating discs 9 fixedly mounted on the side walls of the brush holder 2, and a sliding assembly is mounted on the rotating disc 9 at one end away from the brush holder 2; two arcuate grooves 10 are symmetrically arranged on the two rotating discs 9, and the arc lines of the two arcuate grooves 10 are bent toward the center of the rotating disc 9; screws are inserted into the arcuate 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 into the arcuate 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 to the rotating disc 9 by bolts 12; when the bolts 12 are tightened, the brush holder 2 can be driven to slide through the pulley 8. When the brush holder 2 slides to a suitable position, the bolts 12 are screwed and tightened against the rotating disc 9 to fix the brush holder 10.

[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, the nut is adjusted and loosened so that the rotating disc 9 on the side away from the fixed rod 11 can rotate. At this time, the brush holder 5 is held by hand 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. The nut is then 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, with the grinding cylinder 3 and the annular guide rail 4 both located on the upper platform 13; a rotating motor 14 is provided on the lower platform 13, with gears 15 provided at the ends of the grinding cylinder 3 and the rotating motor 14, 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 turning the handle 17;

[0035] As a preference, the carbon brush 6 includes 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 fixed inside the fixing frame 20 .

[0036] The side wall of the fixing frame 20 is arranged to fit the inner side wall of the carbon brush holder 18; the fixing 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; the fixing frame 20 also includes an activation device, which provides an activation signal to the electrorheological fluid 22. The electrorheological fluid 22 is an intelligent material that can change from liquid to solid under the action of an external electric field. The carbon brush holder 18 of the existing device is made of a 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 carbon brush 6 is adjusted through coarse and fine adjustments as described above, it abuts the grinding cylinder 3. Since the electrorheological fluid 22 is liquid under normal conditions, the carbon brush 6 will adaptively adjust to a more closely fitting angle with the grinding cylinder 3. After the above adjustment is completed, the electrorheological fluid 22 is activated by the activation device, causing it to turn into a solid state, thereby achieving stable clamping of the carbon brush 6.

[0038] The inner wall of the carbon brush holder 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 fixed to the top of the fixed frame 20;

[0039] The working principle of the above-mentioned 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. 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 fit with the grinding cylinder 3, and then tightens the bolt 12 again, so that the fixing rod 11 fits the rotating disc 9 tightly with the annular guide rail 4, thus completing the coarse adjustment; 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 At this time, the rotating disc 9 near the side of 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 and move the brush holder 2 in a circle along the center of the rotating disc 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 to be close enough by the naked eye, start the electrorheological fluid 22 by activating the device, and then keep the two rotating discs 9 locked by tightening the nut to complete the setting. 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's description 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 provided above the base (1), an annular guide rail (4) is provided 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 provided on the annular guide rail (4), the brush holder (2) is also provided with a fine adjustment component, a carbon brush holder (5) is connected to the brush holder (2), and the carbon brush holder (5) is used to install the carbon brush (6) to be ground; an annular slide is provided on the middle part of the inner arc surface and the outer arc surface of the annular guide rail (4); the brush holder (2) is slidably connected to the annular guide rail (4) through the sliding component; the sliding component includes a fixed plate (7) provided on the side wall of the brush holder (2), and the fixed plate (7) is away from the brush holder (2). Four pulleys (8) are provided on the side, and the four pulleys (8) are grouped in pairs, and the two pulleys (8) in each group are respectively slidably clamped on the annular slideways on both sides; the fine-tuning component includes two rotating discs (9) fixedly provided on the side wall of the brush holder (2), and the sliding component is provided on the rotating disc (9) away from one end of the brush holder (2); two arc grooves (10) are symmetrically provided 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 passed through the arc grooves (10) of the two rotating discs (9), and the two rotating discs (9) are connected by screws and nuts; a fixing rod (11) is also included, and 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 to the rotating disc (9) by bolts (12).

2. A generator carbon brush grinding device according to claim 1, characterized in that: Two platforms (13) are provided on the base (1), and 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), and gears (15) are provided at the ends of the grinding cylinder (3) and the rotating motor (14), and the two gears (15) are connected by a toothed belt (16).

3. A generator carbon brush grinding device according to claim 2, characterized in that: A rotating handle (17) is installed at the other end of the grinding cylinder (3).

4. A generator carbon brush grinding device according to claim 1, characterized in that: 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), the other end of the spring (19) is provided with a fixing frame (20), and one end of the carbon brush (6) is fixed inside the fixing frame (20).

5. A generator carbon brush grinding device according to claim 4, characterized in that: The side wall surface of the fixing frame (20) is arranged in contact with the inner side wall surface of the carbon brush holder (18); the fixing 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).

6. A generator carbon brush grinding device according to claim 5, characterized in that: A telescopic rod (21) is provided on the inner wall of the carbon brush bracket (18), 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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