Generator carbon brush non-stop replacement device

Abstract

The invention provides a generator carbon brush non-stop replacing device which comprises a supporting seat, a plurality of carbon brush channels penetrating through the inner side and the outer side in the radial direction are arranged on the supporting seat, a control assembly is correspondingly arranged above the carbon brush channels, an annular guide rail is further coaxially arranged on the outer side of the supporting seat, and a feeding assembly is arranged on the guide rail in a matched mode. The feeding assembly can be moved to the position where the carbon brushes need to be replaced through the guide rail, replacement of the carbon brushes at all positions can be completed through one feeding assembly, the equipment complexity is lowered, the installation difficulty is lowered, and meanwhile the cost is lowered; the carbon brush channel is used for moving and supplementing new carbon brushes, the replaced new carbon brushes are still located at the original positions and do not move left and right, it is ensured that the distances between the carbon brushes are equal, friction force of the collecting ring to the carbon brushes is more uniform when the collecting ring rotates, the carbon brushes are not prone to being abraded, the probability that sparks occur and maintenance and replacement are needed is reduced, and the service life of the collecting ring is prolonged. And the service life of the equipment is correspondingly prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, and in particular to a device for replacing carbon brushes of a generator without stopping the machine. Background Art

[0002] Carbon brushes are devices that transfer energy or signals between the fixed and rotating parts of motors, generators or other rotating machinery. They are generally made of pure carbon and a coagulant. They are generally square in shape and stuck on a metal bracket. There is a spring inside to press it tightly on the shaft. Since its main component is carbon, it is called a carbon brush. It is easy to wear, so it should be regularly maintained and replaced, and carbon deposits should be cleaned. For example, in a generator, the carbon brushes are in contact with the collector rings, so that the electric energy is transmitted to the transmission line through the carbon brushes.

[0003] Although the friction between the slip ring and the carbon brush is very small, in long-term operation, the slip ring will inevitably continue to exert friction on the carbon brush, which will cause wear and scratches on the carbon brush. The carbon brush will generate sparks at these worn parts due to poor current collection. Once sparks are generated, the scars will gradually worsen and expand, and finally form scars of the same size as the sliding contact surface of the carbon brush. More serious sparks will occur, affecting the operation of the excitation system, and the generator set rotor may have a single-point grounding alarm. In severe cases, two-point grounding will occur, which will affect the operation of the generator set and thus affect the power generation operation.

[0004] The carbon brushes cannot be replaced during the operation of the equipment. Only when the carbon brushes spark seriously, can the operating load of the generator set be reduced. When the spark is particularly serious, it is necessary to apply for shutdown. The above situations will affect the safe and stable operation of the generator set. In addition, the normally operating generator set can only be shut down if the power grid system allows it. Otherwise, it is an unplanned shutdown, which will be assessed by the power grid system and bring various losses.

[0005] In addition, sometimes the generator set will be continuously connected to the grid for a long time, especially during the flood season, when the hydropower unit may generate electricity at the maximum output for a long time. At this time, it is difficult to shut down the machine to deal with the ignition of the carbon brush, and continuous operation will cause greater equipment damage, so it is necessary to replace the carbon brush without stopping. The Chinese invention patent with application number CN202310759549.8 discloses an automatic carbon brush replacement device, which relates to the field of carbon brush technology, including a replacement unit, including two carbon brush boxes, an upper opening and a lower opening arranged on the carbon brush box, a storage assembly arranged inside the carbon brush box, a connecting plate arranged between the two carbon brush boxes, a sliding assembly arranged on the connecting plate, a driving assembly arranged on the connecting plate and matched with the sliding assembly, and an in-and-out assembly arranged on the sliding assembly and matched with the upper opening and the lower opening; a propulsion unit, including a mounting plate arranged on one side of the carbon brush box, and two propulsion assemblies arranged on the mounting plate. The carbon brush automatic replacement device can realize automatic replacement of carbon brushes by means of a "relay" of two carbon brushes. It can ensure that the related electrical secondary system maintains electrical connection with the main shaft while replacing the carbon brushes, thus avoiding unit shutdown for replacing carbon brushes.

[0006] However, the above invention can only be used for a local carbon brush, and a large number of carbon brushes are arranged on the collector ring. Each carbon brush needs to be equipped with the above device to achieve the replacement of all carbon brushes, which is inconvenient in installation and the cost is too high. In addition, the above invention requires two carbon brush boxes arranged in parallel to achieve replacement. Therefore, after a single carbon brush is replaced, its position changes, which will cause the spacing between the adjacent carbon brushes on the left and right to be different, which will make the friction force on the collector ring more uneven when it rotates, and it is more likely to increase the friction force, resulting in the problem of carbon brush fire. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a device for replacing carbon brushes of a generator without stopping the machine, which solves the problems of inconvenient installation and high cost in the prior art, as well as uneven friction caused by position change after replacing the carbon brush, which makes sparks more likely to occur.

[0008] According to an embodiment of the present invention, a non-stop generator carbon brush replacement device is provided, the device is arranged in conjunction with a generator collector ring, and includes an annular support seat, the support seat is provided with a plurality of carbon brush channels radially penetrating both inner and outer sides, all of the carbon brush channels are circumferentially distributed at equal intervals around the support seat, a control component is correspondingly arranged above the carbon brush channel, the control component drives the carbon brush to move radially in the carbon brush channel, and the control component does not affect the movement of the carbon brush between the two ends inside the carbon brush channel;

[0009] A guide rail is also provided on the outside of the support seat. The guide rail is an annular structure coaxial with the support seat. A feed assembly is provided on the guide rail. The feed assembly can move along the guide rail in an annular manner to correspond to the position of each carbon brush channel and feed the carbon brush from the outer end of the carbon brush channel into the interior.

[0010] Furthermore, the control component includes a hollow shell arranged above the carbon brush channel, the bottom of the shell is connected to the carbon brush channel, and a pressing mechanism is also arranged in the shell. The pressing mechanism is parallel to the carbon brush channel, and a vertical first telescopic rod is arranged between the pressing mechanism and the top of the shell. The pressing structure is driven to move in the vertical direction by the first telescopic rod, so that it is located inside the shell or inside the carbon brush channel respectively.

[0011] Furthermore, the pressing mechanism includes a fixed part and a movable part, the fixed part is a sleeve structure with one end closed and the other end open, the open end of the fixed part corresponds to the center direction of the support seat, the movable part is slidably arranged inside the fixed part, and the movable part partially extends from the open end of the fixed part, and a second telescopic rod is connected between the closed end of the fixed part and the end of the movable part located inside the fixed part, and the second telescopic rod drives the movable part to move in a direction parallel to the radial direction of the support seat.

[0012] Furthermore, the movable part includes a movable column and a movable disk coaxial with the fixed part, and the movable column and the movable disk can be slidably arranged inside the fixed part, and the movable column portion extends from an open end of the fixed part. A spring is arranged between the movable column and the movable disk, and a contact head is also arranged on the end face of the movable column located outside the fixed part.

[0013] Furthermore, a temperature sensor is also provided on the outside of the housing corresponding to the carbon brush channel close to the center of the support seat.

[0014] Furthermore, a baffle is provided at the bottom of the carbon brush channel near the center end of the support seat, and the baffle is rotatably connected to flip downward to open the bottom surface of the carbon brush channel. A collecting channel is also provided below the carbon brush channel, and the bottom surface of the collecting channel is a sloped surface inclined downward to discharge the fallen carbon brushes.

[0015] Furthermore, a pulley is provided between the guide rail and the feed assembly. The pulley is movably provided on the guide rail and can move freely along the guide rail. The feed assembly is connected to the top of the pulley.

[0016] Furthermore, the feed assembly includes a feed channel located at the bottom, and the feed channel is arranged along the radial direction of the support seat, so that it can move along the guide rail to a position where it is just in front and behind contact with one of the carbon brush channels. The inner end of the feed channel is open and the outer end is closed, and a third telescopic rod is also provided inside the feed channel, one end of the third telescopic rod is fixed to the closed end of the feed channel, and the other end can be telescopic and movable along the extension direction of the feed channel.

[0017] Furthermore, the feed assembly also includes a vertically arranged feed channel, which corresponds to the feed channel and is arranged near one end of the support seat, and the bottom end of the feed channel is connected to the feed channel, and the top end of the feed channel passes through the top of the feed assembly.

[0018] Furthermore, a vacuum suction cup is provided at the movable end of the third telescopic rod.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention is arranged outside the support seat by means of a guide rail, and the feed assembly can move along the guide rail, so as to correspond to each carbon brush channel in turn, so as to move to the position where the carbon brush needs to be replaced, and replace the carbon brush. In this way, the carbon brushes at all positions can be replaced by one feed assembly, which reduces the complexity of the equipment, reduces the difficulty of installation, and also reduces the cost;

[0021] 2. The present invention utilizes radial carbon brush channels to move and replenish new carbon brushes, so that the replaced new carbon brushes remain in the original position without left-right displacement, thereby ensuring that the spacing between each carbon brush is equal, making the friction force of the collector ring on the carbon brush more uniform when rotating, and making it less likely for the carbon brush to wear, thereby reducing the probability of sparks and the need for maintenance and replacement, and correspondingly increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the structure of the carbon brush channel and the control assembly in an embodiment of the present invention.

[0024] Figure 3 Schematic diagram of the structure of the feed assembly in an embodiment of the present invention.

[0025] in: Figure 1 The dotted line indicates the location of the collector ring. Figure 2 and Figure 3 The dotted lines indicate the locations of the carbon brushes.

[0026] In the above drawings: 1. support seat; 2. control component; 3. guide rail; 4. feed component; 5. temperature sensor; 6. collection channel; 11. carbon brush channel; 12. baffle; 21. shell; 22. first telescopic rod; 23. fixing part; 24. movable part; 25. second telescopic rod; 26. contact head; 31. pulley; 41. feed channel; 42. third telescopic rod; 43. supply channel; 241. movable column; 242. movable disk; 243. spring. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] like Figure 1 As shown, an embodiment of the present invention proposes a non-stop generator carbon brush replacement device, which is arranged in conjunction with the generator collector ring, and includes an annular support seat 1, wherein the support seat 1 is coaxially arranged outside the collector ring, so that the conductive contact area on the outer surface of the collector ring contacts the carbon brush installed on the support seat 1. The support seat 1 is fixed by bottom support or top suspension, etc., which will not be described in detail here.

[0029] In this embodiment, the support seat 1 is provided with a plurality of carbon brush channels 11 that radially penetrate the inner and outer sides. In this embodiment, eight carbon brush channels 11 are provided, that is, eight carbon brushes are provided correspondingly. The carbon brush is a rectangular structure, so the carbon brush channel 11 is a rectangular channel corresponding to the shape of the carbon brush, so that the carbon brush can pass through the front and back. All the carbon brush channels 11 are distributed around the support seat 1 at equal intervals in the circumferential direction. A control component 2 is correspondingly provided above the carbon brush channel 11. The control component 2 drives the carbon brush to move radially in the carbon brush channel 11, so that one end of the carbon brush can partially extend out of the outside of the carbon brush channel 11, thereby abutting against the surface of the collector ring to realize current transmission. And the control component 2 does not affect the movement of the carbon brush between the two ends inside the carbon brush channel 11, so that a new carbon brush can be inserted from the end of the carbon brush channel 11 away from the collector ring for replacement.

[0030] like Figure 2As shown, as a preference, in this embodiment, the control component 2 includes a hollow shell 21 arranged above the carbon brush channel 11, the bottom of the shell 21 is connected to the carbon brush channel 11, and a pressing mechanism is also arranged in the shell 21, the pressing mechanism is parallel to the carbon brush channel 11, and a vertical first telescopic rod 22 is arranged between the pressing mechanism and the top of the shell 21, and the pressing structure is driven to move in the vertical direction by the first telescopic rod 22, so that it is located inside the shell 21 or inside the carbon brush channel 11 respectively. It should be noted that there is a spacing greater than the length of the carbon brush between the pressing mechanism and the end face of the carbon brush channel 11 corresponding to the collector ring side, so that the carbon brush will not block the pressing mechanism from moving up and down. Obviously, when the carbon brush is located at a position close to one end of the collector ring in the carbon brush channel 11, the pressing mechanism can be moved into the carbon brush channel 11 through the first telescopic rod 22, and then the pressing mechanism can push the carbon brush out of the carbon brush channel 11 to achieve contact between it and the collector ring. When the carbon brush needs to be replaced, the pressing mechanism is raised by the first telescopic rod 22 so as not to hinder the insertion of a new carbon brush.

[0031] Further in this embodiment, the pressing mechanism includes a fixed part 23 and a movable part 24, wherein the fixed part 23 is a sleeve structure with one end closed and the other end open, the open end of the fixed part 23 corresponds to the center direction of the support seat 1, the movable part 24 is slidably arranged inside the fixed part 23, and the movable part 24 partially extends from the open end of the fixed part 23, and a second telescopic rod 25 is connected between the closed end of the fixed part 23 and the end of the movable part 24 located inside the fixed part 23, and the second telescopic rod 25 drives the movable part 24 to move in a direction parallel to the radial direction of the support seat 1. When the pressing assembly is located inside the carbon brush channel 11 and needs to perform pressing work, the second telescopic rod 25 pushes the movable part 24 to extend and push the carbon brush out, and when the pressing assembly needs to be retracted, the second telescopic rod 25 first retracts the movable part 24, and then the first telescopic rod 22 moves the pressing mechanism as a whole upward and retracts it into the housing 21.

[0032] In a preferred solution, the movable member 24 includes a movable column 241 and a movable disk 242 coaxial with the fixed member 23, the movable column 241 and the movable disk 242 are both slidably arranged inside the fixed member 23, and the movable column 241 partially extends from the open end of the fixed member 23, a spring 243 is arranged between the movable column 241 and the movable disk 242, and a contact head 26 is also arranged on the end surface of the movable column 241 located outside the fixed member 23. The spring 243 can realize elastic fixation of the movable column 241 and the carbon brush, so that the slight radial force applied to the carbon brush during operation can be absorbed by the spring 243, thereby avoiding damage to the carbon brush.

[0033] In this embodiment, a temperature sensor 5 is further provided on the outside of the housing 21 corresponding to the carbon brush channel 11 near the center of the support seat 1. That is, the temperature sensor 5 is provided close to the working position of the carbon brush, so as to monitor the temperature of the carbon brush at all times. When the carbon brush is subjected to excessive friction, damage and sparks appear, the temperature will rise rapidly, which can be detected by the temperature sensor 5, so as to replace the carbon brush and achieve better intelligent control.

[0034] A baffle 12 is provided at the bottom of the carbon brush channel 11 near the center end of the support seat 1. The length of the baffle 12 completely covers the carbon brush, so that when the carbon brush is in contact with the collector ring, it is completely located above the baffle 12. The baffle 12 is rotatably connected to flip downward to open the bottom surface of the carbon brush channel 11, so that the carbon brush loses support and falls downward. A collection channel 6 is also provided below the carbon brush channel 11. The bottom surface of the collection channel 6 is a sloped surface tilted downward to discharge the fallen carbon brush. A collection bucket (not shown) can be provided at the end of the collection channel 6 to collect the discharged waste carbon brushes and treat them uniformly.

[0035] A guide rail 3 is also provided on the outside of the support seat 1. The guide rail 3 is an annular structure coaxial with the support seat 1. A feed assembly 4 is provided on the guide rail 3. The feed assembly 4 can move in an annular manner along the guide rail 3, so as to correspond to the position of each carbon brush channel 11 and feed the carbon brush from the outer end of the carbon brush channel 11 into the interior. A pulley 31 is also provided between the guide rail 3 and the feed assembly 4. The pulley 31 is movably provided on the guide rail 3 and can move freely along the guide rail 3. The feed assembly 4 is connected to the top of the pulley 31. The connection method of the guide rail 3 and the pulley 31 in this embodiment refers to the electric guide rail 3 in the prior art, and will not be described here.

[0036] like Figure 3As shown, in a further scheme, the feed assembly 4 includes a feed channel 41 located at the bottom, and the feed channel 41 is arranged along the radial direction of the support seat 1, so that it can be moved along the guide rail 3 to a position that is just in front and behind one of the carbon brush channels 11. The inner end of the feed channel 41 is open, and the outer end is closed. A third telescopic rod 42 is also arranged inside the feed channel 41. One end of the third telescopic rod 42 is fixed to the closed end of the feed channel 41, and the other end can be telescopically movable along the extension direction of the feed channel 41. If there is a carbon brush for replacement in front of the third telescopic rod 42, the carbon brush can be pushed into the corresponding carbon brush channel 11 through the third telescopic rod 42 to complete the feeding of the new carbon brush. Correspondingly, the feed assembly 4 also includes a vertically arranged feed channel 43, and the feed channel 43 is arranged corresponding to the feed channel 41 near one end of the support seat 1, and the bottom end of the feed channel 43 is connected to the feed channel 41, and the top end of the feed channel 43 passes through the top of the feed assembly 4. Spare carbon brushes can be stacked and placed in the feed channel 43. Each time the bottom carbon brush is pushed away by the third telescopic rod 42, the upper carbon brushes fall down for spare use, thereby achieving sustainable replacement of carbon brushes, and the staff can replenish new carbon brushes from the feed channel 43 at regular intervals.

[0037] Preferably, a vacuum suction cup is further provided at the movable end of the third telescopic rod 42. Considering that there is a certain gap between the feeding channel 43 and the carbon brush channel 11, in order to prevent the carbon brush from moving when passing through the gap and getting stuck at the entrance of the carbon brush channel 11, the carbon brush can be adsorbed and fixed by the vacuum suction cup, so that it can be more stably transported to the inside of the carbon brush channel 11, and then the third telescopic rod 42 can be retracted by contact and adsorption.

[0038] When the present invention is in use, the temperature of the carbon brush is first detected by the temperature sensor 5. When it is detected that the temperature of a certain carbon brush is too high, the feed assembly 4 is moved to the position corresponding to the carbon brush channel 11 by the pulley 31, so that the feed channel 41 is in line with the carbon brush channel 11. At this time, the second telescopic rod 25 is retracted to release the pressing and fixing of the carbon brush to be replaced, so that it is not in close contact with the collector ring, and then the baffle 12 is flipped to make the carbon brush fall into the collection channel 6 and discharged. Then the first telescopic rod 22 is retracted, and the pressing mechanism is raised as a whole to the inside of the shell 21, so that the carbon brush channel 11 is connected from front to back, and then the third telescopic rod 42 is operated to push the new carbon brush into the carbon brush channel 11, and continue to push the new carbon brush to move to the front section of the carbon brush channel 11, not in the position below the pressing assembly. Finally, the first telescopic rod 22 is extended to move the pressing assembly into the carbon brush channel 11 again, and the second telescopic rod 25 is extended to push the movable part 24 to move, and the contact head 26 is connected to the carbon brush to realize circuit connection, and finally the carbon brush is pushed out to abut the outside of the collector ring, and the replacement work is completed.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A device for replacing carbon brushes of a generator without stopping the machine, the device is arranged in conjunction with a collector ring of the generator, and is characterized in that: The invention comprises an annular support seat, wherein a plurality of carbon brush channels are arranged on the support seat and radially penetrate the inner and outer sides, wherein all the carbon brush channels are circumferentially distributed at equal intervals around the support seat, and a control component is correspondingly arranged above the carbon brush channel, wherein the control component drives the carbon brush to move radially in the carbon brush channel, and the control component does not affect the movement of the carbon brush between the two ends inside the carbon brush channel; A guide rail is also provided on the outside of the support seat. The guide rail is an annular structure coaxial with the support seat. A feed assembly is provided on the guide rail. The feed assembly can move along the guide rail in an annular manner to correspond to the position of each carbon brush channel and feed the carbon brush from the outer end of the carbon brush channel into the interior.

2. A non-stop generator carbon brush replacement device as claimed in claim 1, characterized in that: The control component includes a hollow shell arranged above the carbon brush channel, the bottom of the shell is connected to the carbon brush channel, and a pressing mechanism is also arranged in the shell. The pressing mechanism is parallel to the carbon brush channel, and a vertical first telescopic rod is arranged between the pressing mechanism and the top of the shell. The pressing structure is driven to move in the vertical direction by the first telescopic rod, so that it is located inside the shell or inside the carbon brush channel respectively.

3. A non-stop generator carbon brush replacement device as claimed in claim 2, characterized in that: The pressing mechanism includes a fixed part and a movable part. The fixed part is a sleeve structure with one end closed and the other end open. The open end of the fixed part corresponds to the center direction of the support seat. The movable part is slidably arranged inside the fixed part, and the movable part partially extends from the open end of the fixed part. A second telescopic rod is connected between the closed end of the fixed part and an end of the movable part located in the fixed part. The second telescopic rod drives the movable part to move in a direction parallel to the radial direction of the support seat.

4. A non-stop generator carbon brush replacement device as claimed in claim 3, characterized in that: The movable part includes a movable column and a movable disk coaxial with the fixed part. The movable column and the movable disk can be slidably arranged inside the fixed part, and the movable column part extends out from an open end of the fixed part. A spring is arranged between the movable column and the movable disk. A contact head is also arranged on an end surface of the movable column located outside the fixed part.

5. The non-stop generator carbon brush replacement device according to claim 2, characterized in that: A temperature sensor is also arranged outside the shell at one end of the carbon brush channel close to the center of the support seat.

6. The non-stop generator carbon brush replacement device according to claim 1, characterized in that: A baffle is provided at the bottom of the carbon brush channel near the center end of the support seat, and the baffle is rotatably connected to flip downward to open the bottom surface of the carbon brush channel. A collecting channel is also provided below the carbon brush channel, and the bottom surface of the collecting channel is a sloped surface inclined downward to discharge the fallen carbon brushes.

7. The non-stop generator carbon brush replacement device according to claim 1, characterized in that: A pulley is also arranged between the guide rail and the feeding assembly. The pulley is movably arranged on the guide rail and can move freely along the guide rail. The feeding assembly is connected to the top of the pulley.

8. The non-stop generator carbon brush replacement device according to claim 1, characterized in that: The feed assembly includes a feed channel at the bottom, which is arranged along the radial direction of the support seat so that it can move along the guide rail to a position where it is just in front and back contact with one of the carbon brush channels. The inner end of the feed channel is open and the outer end is closed. A third telescopic rod is also arranged inside the feed channel, one end of the third telescopic rod is fixed to the closed end of the feed channel, and the other end can be telescopically movable along the extension direction of the feed channel.

9. A non-stop generator carbon brush replacement device as claimed in claim 8, characterized in that: The feed assembly also includes a vertically arranged feed channel, which corresponds to the feed channel and is arranged close to one end of the support seat, and the bottom end of the feed channel is connected to the feed channel, and the top end of the feed channel passes through the top of the feed assembly.

10. The non-stop generator carbon brush replacement device according to claim 8, characterized in that: A vacuum suction cup is also arranged at the movable end of the third telescopic rod.

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