Arc grinding equipment for excitation carbon brush of large steam turbine generator

Abstract

The arc grinding equipment comprises a platform and a support, the platform is located on the upper portion of the support, the platform is provided with an opening, a motor is arranged on the lower portion of the platform, an output shaft of the motor is connected with a disc grinding tool, and the disc grinding tool penetrates through the opening. A stand column is arranged on one side of the upper portion of the platform and connected with a transverse rod, one end of the transverse rod is connected with a fixing frame through a universal adjusting mechanism, a carbon brush box used for containing a carbon brush is arranged on the lower portion of the fixing frame, and the fixing frame is further provided with a spring used for enabling the carbon brush to abut against the disc grinding tool all the time. The arc surface of the new carbon brush is rapidly matched with the arc surface of the generator rotor slip ring, the generator rotor slip ring is prevented from heating and sparking, the service life of the slip ring is prolonged, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of generator maintenance equipment, in particular to arc grinding equipment for excitation carbon brushes of large steam turbine generators. Background Art

[0002] After the generator has been running for a long time, the generator excitation carbon brushes need to be replaced. There are more than one hundred generator excitation carbon brushes that are in dynamic and static sliding contact with the rotor slip ring, transmitting several thousand amperes of excitation DC. Traditionally, new carbon brushes are directly replaced. Under natural running-in conditions, the new carbon brushes need 72 hours to ensure that the arc surface is in full contact with the outer wall of the rotor slip ring. However, during the natural running-in stage, due to poor contact between the new carbon brushes and the rotor slip ring, problems such as poor current conduction, heat and sparking will occur, and in severe cases, the slip ring and brush holder will be burned out, reducing the service life of the slip ring. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide an arc grinding device for the excitation carbon brush of a large steam turbine generator, which can quickly achieve the matching of the arc surface of the new carbon brush with the arc surface of the generator rotor slip ring, avoid heating and sparking of the generator rotor slip ring, and extend the service life of the slip ring. The prepared new carbon brush has good precision and strong practicality, and can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an arc grinding device for an excitation carbon brush of a large steam turbine generator, comprising a platform and a bracket, wherein the platform is located at the upper part of the bracket, the platform is provided with an opening, a motor is provided at the lower part of the platform, the output shaft of the motor is connected to a disc grinder, and the disc grinder passes through the opening; a column is provided on one side of the upper part of the platform, the column is connected to a cross bar, one end of the cross bar is connected to a fixing frame through a universal adjustment mechanism, a carbon brush box for placing a carbon brush is provided at the lower part of the fixing frame, and the fixing frame is also provided with a spring for making the carbon brush always contact the disc grinder.

[0005] Preferably, the universal adjustment mechanism includes an upper shell, a lower cover body and a universal ball head. The lower cover body is connected to the upper shell by multiple bolts. The universal ball head is adapted to the upper shell and the lower cover body. The upper part of the upper shell is threadedly connected with a fastening bolt for locking the universal ball head in the upper shell and the lower cover body. The universal ball head is connected to the fixing frame through a connecting rod, and the cross bar is connected to the upper shell.

[0006] Preferably, the fixing frame is L-shaped, the side wall of the carbon brush box is provided with a screw rod, the screw rod passes through the vertical side plate of the fixing frame, the screw rod is threadedly connected with a nut, the upper end of the spring is connected to the horizontal side plate of the fixing frame, and the lower end of the spring contacts the carbon brush.

[0007] Preferably, a connecting sleeve is provided at the end of the cross bar, the connecting sleeve is slidably matched with the column, and a locking bolt is provided on the side wall of the connecting sleeve.

[0008] Preferably, the end of the fastening bolt has an arc groove adapted to the surface of the universal ball head.

[0009] Preferably, a soft-handle lamp is also provided on one side of the column body of the column.

[0010] Preferably, the diameter of the disc grinder is equal to the diameter of the generator slip ring, and sandpaper is bonded to the surface of the disc grinder as a grinding surface.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the carbon brush becomes shorter due to wear during use and becomes a short carbon brush. The short magnetic brush is removed and installed in the carbon brush box. The fastening bolts of the universal adjustment mechanism are loosened, and the angle of the carbon brush box is adjusted according to the arc surface of the short carbon brush. After the angle of the carbon brush box is determined, the fastening bolts are tightened, and a new carbon brush is placed in the carbon brush box. The spring presses the new carbon brush, and the motor drives the disc grinder to rotate. The new carbon brush is completely consistent with the arc surface of the short carbon brush, and the arc surface of the new carbon brush is quickly matched with the arc surface of the generator rotor slip ring, thereby avoiding heating and sparking of the generator rotor slip ring and extending the service life of the slip ring. The new carbon brush prepared by the equipment has good precision and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a side view of the utility model;

[0014] Figure 3 It is an enlarged schematic diagram of the local structure of the utility model.

[0015] In the figure: 1 platform, 2 bracket, 3 disc mold, 4 column, 5 cross bar, 5.1 connecting sleeve, 6 universal adjustment mechanism, 6.1 upper shell, 6.2 bolt, 6.3 lower cover, 6.4 universal ball head, 6.5 fastening bolt, 6.6 connecting rod, 7 fixing frame, 8 carbon brush box, 8.1 screw, 8.2 nut, 9 spring, 10 motor, 11 soft handle lamp. DETAILED DESCRIPTION

[0016] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0017] See also Figure 1-3The utility model provides a technical solution: an arc grinding device for an excitation carbon brush of a large steam turbine generator, comprising a platform 1 and a bracket 2, wherein the platform 1 is located on the upper part of the bracket 2, the platform 1 is provided with an opening, a motor 10 is provided at the lower part of the platform 1, and a disc grinder 3 is connected to the output shaft of the motor 10, and the disc grinder 3 passes through the opening; a column 4 is provided on one side of the upper part of the platform 1, the column 4 is connected to a cross bar 5, one end of the cross bar 5 is connected to a fixing frame 7 through a universal adjustment mechanism 6, a carbon brush box 8 for placing a carbon brush is provided at the lower part of the fixing frame 7, and the fixing frame 7 is also provided with a spring 9 for making the carbon brush always contact the disc grinder 3;

[0018] Put the old worn short carbon brush into the carbon brush box 8 first, adjust the angle of the carbon brush box 8 according to the arc surface of the short carbon brush, that is, adjust the angle through the universal adjustment mechanism 6, take out the short carbon brush after the angle of the carbon brush box 8 is determined, put the new carbon brush into the carbon brush box 8, the spring 9 presses the new carbon brush, and the motor 10 drives the disc grinder 3 to rotate and grind the new carbon brush, so that the arc surface of the new carbon brush matches the arc surface of the generator rotor slip ring, which solves the problem of poor contact or natural running-in during traditional direct replacement, causing the generator rotor slip ring to heat up and spark. The patented equipment is used to grind the new carbon brush, and the arc surface can be matched in 4 hours, extending the service life of the slip ring;

[0019] It should be noted that there are more than one hundred carbon brushes in the generator. Due to the inevitable installation error of the carbon brushes, when the carbon brushes are in contact with the generator rotor slip ring, each carbon brush has a curved surface, which is not universal and has differences. Therefore, a universal adjustment mechanism 6 is required to adjust the angle.

[0020] Specifically, the universal adjustment mechanism 6 includes an upper shell 6.1, a lower cover 6.3 and a universal ball head 6.4. The lower cover 6.3 is connected to the upper shell 6.1 by a plurality of bolts 6.2. The universal ball head 6.4 is adapted to the upper shell 6.1 and the lower cover 6.3. The upper part of the upper shell 6.1 is threadedly connected with a fastening bolt 6.5 for locking the universal ball head 6.4 in the upper shell 6.1 and the lower cover 6.3, so as to facilitate disassembly and installation. The universal ball head 6.4 is connected to the fixing frame 7 by a connecting rod 6.6, and the cross bar 5 is connected to the upper shell 6.1; that is, when adjusting, the fastening bolt 6.5 is loosened, and the universal ball head 6.4 can rotate in the upper shell 6.1 and the lower cover 6.3 to adjust the angle within a certain range. After the angle is determined, the fastening bolt 6.5 is tightened, and the fastening bolt 6.5 locks the universal ball head 6.4.

[0021] Furthermore, the fixing frame 7 is L-shaped, and the side wall of the carbon brush box 8 is provided with a screw 8.1, the screw 8.1 passes through the vertical side plate of the fixing frame 7, the screw 8.1 is threadedly connected with a nut 8.2, the upper end of the spring 9 is connected to the horizontal side plate of the fixing frame 7, and the lower end of the spring 9 is in contact with the carbon brush; the carbon brush box 8 is connected to the fixing frame 7 by the bolt 8.1 and the nut 8.2, which is convenient for disassembly and installation, and the corresponding matching carbon brush box 8 can be replaced according to different specifications of the carbon brush, which is flexible and convenient to use;

[0022] Furthermore, a connecting sleeve 5.1 is provided at the end of the crossbar 5, and the connecting sleeve 5.1 is slidably matched with the column 4, and a locking bolt is provided on the side wall of the connecting sleeve 5.1, so that the height of the crossbar 5 can be adjusted according to the usage;

[0023] Furthermore, the end of the fastening bolt 6.5 has an arc groove adapted to the surface of the universal ball head 6.4, and the arc groove and the universal ball head 6.4 have a larger contact surface, which increases the friction force and makes the locking more secure;

[0024] In addition, a soft-handled lamp 11 is provided on one side of the column body of the column 4. When the short carbon brush contacts the disc grinder 3, the soft-handled lamp 11 is used to illuminate and transmit light through the gap to judge the fit between the short carbon brush and the disc grinder 3, that is, the fit between the arc surface of the short carbon brush and the disc grinder 3, so that the precision is more accurate; the diameter of the disc grinder 3 is equal to the diameter of the generator slip ring, that is, the arc of the carbon brush after grinding can match the slip ring, and sandpaper is bonded to the surface of the disc grinder 3 as a grinding surface.

[0025] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended to include all changes that fall within the meaning and scope of equivalent elements in the content of the present invention.

Claims

1. An arc grinding device for an excitation carbon brush of a large steam turbine generator, comprising a platform (1) and a bracket (2), characterized in that: The platform (1) is located at the upper part of the bracket (2), the platform (1) is provided with an opening, a motor (10) is provided at the lower part of the platform (1), the output shaft of the motor (10) is connected to a circular grinding tool (3), and the circular grinding tool (3) passes through the opening; a column (4) is provided at one side of the upper part of the platform (1), the column (4) is connected to a crossbar (5), one end of the crossbar (5) is connected to a fixing frame (7) via a universal adjustment mechanism (6), a carbon brush box (8) for placing a carbon brush is provided at the lower part of the fixing frame (7), and the fixing frame (7) is also provided with a spring (9) for making the carbon brush always contact the circular grinding tool (3).

2. The arc grinding device for the excitation carbon brush of a large steam turbine generator according to claim 1 is characterized in that: The universal adjustment mechanism (6) comprises an upper shell (6.1), a lower cover (6.3) and a universal ball head (6.4); the lower cover (6.3) is connected to the upper shell (6.1) via a plurality of bolts (6.2); the universal ball head (6.4) is adapted to fit inside the upper shell (6.1) and the lower cover (6.3); the upper portion of the upper shell (6.1) is threadedly connected to a fastening bolt (6.5) for locking the universal ball head (6.4) inside the upper shell (6.1) and the lower cover (6.3); the universal ball head (6.4) is connected to a fixing frame (7) via a connecting rod (6.6); and the cross bar (5) is connected to the upper shell (6.1).

3. The arc grinding device for the excitation carbon brush of a large steam turbine generator according to claim 1 is characterized in that: The fixing frame (7) is L-shaped, and a screw (8.1) is provided on a side wall of the carbon brush box (8), the screw (8.1) passes through a vertical side plate of the fixing frame (7), a nut (8.2) is threadedly connected to the screw (8.1), the upper end of the spring (9) is connected to the horizontal side plate of the fixing frame (7), and the lower end of the spring (9) contacts the carbon brush.

4. The arc grinding device for the excitation carbon brush of a large steam turbine generator according to claim 1 is characterized in that: A connecting sleeve (5.1) is provided at the end of the crossbar (5), the connecting sleeve (5.1) is slidably matched with the column (4), and a locking bolt is provided on the side wall of the connecting sleeve (5.1).

5. The arc grinding device for the excitation carbon brush of a large steam turbine generator according to claim 2 is characterized in that: The end of the fastening bolt (6.5) has an arc groove adapted to the surface of the universal ball head (6.4).

6. The arc grinding device for the excitation carbon brush of a large steam turbine generator according to claim 1 is characterized in that: A soft-handle lamp (11) is also provided on one side of the column body of the upright column (4).

7. The arc grinding device for the excitation carbon brush of a large steam turbine generator according to claim 1 is characterized in that: The diameter of the disc grinder (3) is equal to the diameter of the generator slip ring, and sandpaper is bonded to the surface of the disc grinder (3) as a grinding surface.

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