CN109590860B

CN109590860B - Motor carbon brush grinding tool

Info

Publication number: CN109590860B
Application number: CN201810588998.XA
Authority: CN
Inventors: 黄才文
Original assignee: China Nuclear Industry Maintenance Co Ltd
Current assignee: China Nuclear Industry Maintenance Co Ltd
Priority date: 2018-06-08
Filing date: 2018-06-08
Publication date: 2020-12-04
Anticipated expiration: 2038-06-08
Also published as: CN109590860A

Abstract

The invention provides a motor carbon brush grinding tool, which belongs to the technical field of motor maintenance assistance and comprises a front support, a rear support and a rotating shaft, wherein the rotating shaft is supported between the front support and the rear support and is rotatably connected with the front support and the rear support, a sliding ring for grinding a carbon brush is installed on the rotating shaft, a supporting rod parallel to the rotating shaft is fixedly arranged on the front support and/or the rear support, at least one brush holder for installing the carbon brush is arranged on the supporting rod, the brush holder comprises two installation frames which are opened towards the direction of the sliding ring at 90 degrees, and each installation frame is respectively provided with a carbon brush tangent to the outer circumferential surface of the sliding ring. The grinding tool for the carbon brush of the motor provided by the invention is used for grinding the carbon brush of the RAM generator of the nuclear power station, so that the working efficiency of replacing the carbon brush of the RAM generator in the nuclear power overhaul process can be improved, the working time is reduced, the risk of artificially introducing the carbon brush to the generator is reduced, and the safety and stability of a reactor are improved.

Description

Motor carbon brush grinding tool

Technical Field

The invention belongs to the technical field of motor maintenance assistance, and particularly relates to a motor carbon brush polishing tool.

Background

A RAM generator system (namely a control rod driving mechanism power supply system) of a nuclear power station is a control power supply system of a reactor control rod, two generators provide power supply for the reactor control rod, two ways are mutually standby and redundant, in an excitation system of the two generators, excitation current is contacted with a slip ring fixed on a generator rotor through four carbon brushes to provide excitation current for a rotor winding, under the normal operation working condition of the reactor, the generator needs to be kept in an operation state, friction exists between the slip ring of the generator and the carbon brushes all the time, therefore, under the normal operation working condition, the carbon brushes are continuously in an abrasion state, each time passes, when the carbon brushes are abraded to a certain limit value, the corresponding generator needs to be stopped to be moved down to be replaced by a new carbon brush, the machine sets record IO state, at the moment, if the other RAM generator fails, the reactor is directly jumped to jump, in view of the importance of the RAM system, whether the RAM system can safely and stably operate is directly related to the safe and stable operation of the reactor.

At present, for the replacement of the carbon brush of the RAM generator, after the generator is stopped, the old carbon brush is removed, and a new carbon brush is installed, but because the new spare part carbon brush is in a cuboid shape, in order to ensure good contact between the carbon brush and the slip ring, the bottom of the spare part carbon brush needs to be polished to a certain radian, and then the spare part carbon brush is attached to the surface radian of the slip ring, so that the good contact between the carbon brush and the slip ring is ensured. At present, in order to ensure that the radian of carbon brush polishing can be better attached to a slip ring, an operation method is adopted, a layer of abrasive paper is sleeved on the surface of the slip ring of a generator on site, a spare part carbon brush is arranged on a brush holder to apply certain spring pressure, the carbon brush is polished by manually rotating a rotor of the generator, the radian of the polished carbon brush can be maximally attached to the surface of the slip ring on site, but the shutdown time of the generator is also increased, the time of losing a spare loop of a reactor control rod control power supply system is prolonged, the safe and stable operation of a reactor is not facilitated, the method is clumsy, the manually rotating the rotor is more strenuous, the requirement on the matching default degree between members of operation groups is high, in addition, residual adhesive plaster for adhering the abrasive paper is easily left on the slip ring of the generator, if the residual adhesive plaster is not cleaned, the generator can be in a normal operation state, the carbon brush has a sparking phenomenon, and a serious event occurs.

In summary, at present, no better method or tool is available for polishing the carbon brush, so that the polished carbon brush can be attached to an on-site slip ring to the maximum extent, risks such as sparking and the like of the carbon brush of the generator caused by artificial introduction factors can be reduced, the outage time of the generator can be shortened, and the safety and stability of a reactor are improved.

Disclosure of Invention

The invention aims to provide a grinding tool for a carbon brush of a motor, which aims to solve the technical problem of operation risk caused by stopping the motor when the carbon brush is ground in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a motor carbon brush burnisher, including fore-stock, after-poppet and support in between fore-stock and the after-poppet and with the fore-stock with the after-poppet rotates the pivot that links to each other, the installation is used for polishing the sliding ring of carbon brush in the pivot, the fore-stock and/or fixed being equipped with on the after-poppet with the parallel bracing piece of pivot, at least, be equipped with a brush holder that is used for installing the carbon brush on the bracing piece, the brush holder includes two orientations the sliding ring direction is 90 open mounting brackets, every be equipped with on the mounting bracket respectively one with the tangent carbon brush of the outer periphery of sliding ring.

Furthermore, a layer of sand paper used for polishing the carbon brush is arranged on the outer circumferential surface of the slip ring.

Further, the slip ring is made of plastic.

Furthermore, one end of the rotating shaft is provided with a handle for rotating the rotating shaft.

Furthermore, a threaded sleeve is arranged on the front support or the rear support, an external thread matched with the threaded sleeve in a threaded manner is arranged at one end of the supporting rod, and the supporting rod is in threaded connection with the threaded sleeve.

Furthermore, one end of the supporting rod is also provided with a locking screw used for locking the supporting rod to prevent the supporting rod from rotating, and the locking screw penetrates through the supporting rod along the radial direction of the threaded sleeve to tightly screw the supporting rod.

Furthermore, an elastic pressing mechanism for pressing the carbon brush is respectively arranged on the mounting rack.

Furthermore, the elastic pressing mechanism comprises a guide pillar fixedly connected with the mounting frame and a rotary pressing plate sleeved on the guide pillar, a spring is arranged between the rotary pressing plate and the mounting frame and sleeved on the guide pillar, a nut used for pressing the rotary pressing plate is arranged at one end, far away from the spring, of the guide pillar, and the center line of the guide pillar is perpendicular to the tangent line of the outer circumferential surface of the slip ring.

Further, the base plate is used for installing and supporting the front support and the rear support.

Furthermore, two brush holders are arranged on the supporting rod.

The grinding tool for the carbon brush of the motor has the advantages that: compared with the prior art, the tool for polishing the carbon brush of the motor has the advantages that the appearance size of the slip ring is the same as that of the slip ring of the motor, the spare carbon brush is arranged on the mounting frame, the rotating shaft is rotated to enable the slip ring to rotate, the spare carbon brush can be polished in advance in an off-line mode, the polished carbon brush can be directly arranged on the slip ring of the motor after the motor stops running, the traditional method that the slip ring of the motor is sleeved with sand paper to polish the carbon brush is eliminated, the risk of artificially introducing foreign matters is reduced, and the reliability of the motor is improved; the invention also has the effects of small volume, light weight and convenient carrying and use by field operators; the carbon brush of the RAM generator of the nuclear power station is polished, so that the operation efficiency of replacing the carbon brush of the RAM generator in the nuclear power overhaul process can be improved, the operation time is reduced, the risk of artificially introducing the carbon brush to the generator is reduced, and the safety and stability of a reactor are improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a motor carbon brush grinding tool according to an embodiment of the present invention;

fig. 2 is a first schematic structural diagram of a brush holder in the motor carbon brush grinding tool according to the embodiment of the present invention;

fig. 3 is a second schematic structural diagram of a brush holder in the motor carbon brush grinding tool according to the embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1-rear support; 2-front support; 3-supporting rods; 31-a threaded sleeve; 4-a slip ring; 41-a rotating shaft; 5-a bottom plate; 6-a handle; 7-a bearing; 8-brush holder; 81-a mounting rack; 821-guide pillar; 822-a spring; 823-rotating the platen; 824-nut; 825-a U-shaped slot; 826-fixed press plate; 83-split ring; 84-bolt; 9-carbon brush.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 and 2 together, a description will now be given of a carbon brush grinding tool for a motor according to the present invention. The motor carbon brush grinding tool comprises a front support 2, a rear support 1 and a rotating shaft 41 which is supported between the front support 2 and the rear support 1 and is rotatably connected with the front support 2 and the rear support 1, a sliding ring 4 used for grinding a carbon brush is installed on the rotating shaft 41, the diameter of the sliding ring 4 is the same as that of the sliding ring 4 matched with a motor, a supporting rod 3 parallel to the rotating shaft 41 is fixedly arranged on the front support 2 and/or the rear support 1, at least one brush holder 8 used for installing the carbon brush is arranged on the supporting rod 3, the brush holder 8 comprises two mounting frames 81 which are 90 degrees open towards the direction of the sliding ring 4, and each mounting frame 81 is respectively provided with a carbon brush 9 tangent to the outer circumferential surface of the sliding ring 4.

Compared with the prior art, the grinding tool for the motor carbon brush provided by the invention has the following beneficial effects:

(1) the slip ring 4 and the slip ring of the motor matched with the carbon brush have the same structure, so that the actual simulation of a field is facilitated, the size and relative position relation of two main components, namely the slip ring of the generator and the brush holder 8 on the field is simulated, the field condition can be simulated to the maximum extent by the tool, and the ground carbon brush can be attached to the slip ring on the field to the maximum extent;

(2) the grinding tool provided by the invention can grind the carbon brush off-line, and the carbon brush can be ground firstly in a work preparation stage before the shutdown of the generator, and can be directly replaced on the slip ring after the shutdown of the generator, so that the shutdown time of the generator is reduced, and the safety and stability of a reactor are improved;

(3) according to the polishing tool provided by the invention, the conventional method for polishing the carbon brush by manually rotating the rotor is eliminated, the weight of the generator rotor and the flywheel exceeds one ton, the manual rotation wastes time and labor, and the qualified carbon brush can be polished only by tacit cooperation among operation team members;

(4) the grinding tool provided by the invention eliminates the previous method of sleeving abrasive paper on the slip ring of the generator to grind the carbon brush, reduces the risk of artificially introducing foreign matters and improves the reliability of the generator;

(5) the grinding tool provided by the invention has the advantages that the design of unnecessary parts is reduced as much as possible in design, the effects of small volume and light weight are achieved, and the grinding tool is convenient for field operators to carry and use.

Further, as an embodiment of the carbon brush grinding tool for a motor according to the present invention, the outer circumferential surface of the slip ring 4 is provided with a layer of sand paper for grinding the carbon brush. The sand paper is pasted on the outer circumferential surface of the slip ring 4 and can be replaced to ensure the grinding quality.

Further, as a specific embodiment of the motor carbon brush polishing tool provided by the invention, the slip ring 4 is made of plastic and is used for reducing the weight of the tool, and the rear support 1, the money support, the rotating shaft 41 and the support rod 3 are made of carbon steel and ensure the supporting strength.

Further, referring to fig. 1, as an embodiment of the carbon brush grinding tool for a motor according to the present invention, a handle 6 for rotating the rotating shaft 41 is provided at one end of the rotating shaft 41. The operation is labor-saving by shaking the handle 6 to rotate the slip ring 4. Wherein, weld bearing 7 respectively on fore-stock 2 and after-poppet 1, the both ends of pivot 41 rotate with bearing 7 and link to each other, directly use bearing 7, also do benefit to and alleviate holistic weight. For the installation of the handle 6, one end of the rotating shaft 41 is provided with a threaded hole which transversely penetrates through the center of the rotating shaft 41, a screw rod is fixed on the handle 6, the screw rod penetrates through the threaded hole to be matched with the threaded hole, and then is locked by a nut to prevent the handle 6 from falling off, so that the installation of the handle 6 is detachable, and the installation and the disassembly are also very convenient.

Further, referring to fig. 1, as an embodiment of the motor carbon brush grinding tool according to the present invention, a threaded sleeve 31 is disposed on the front bracket 2 or the rear bracket 1, an external thread that is in threaded engagement with the threaded sleeve 31 is disposed at one end of the support rod 3, and the support rod 3 is in threaded connection with the threaded sleeve 31. In this embodiment, weld thread bush 31 on back support 1, also can replace with the nut, for supporting reliably, establish the notched support in the welding of fore-stock 2, the one end suit of bracing piece 3 is in thread bush 31, and the other end supports on the support, adopts the support, is convenient for install bracing piece 3 in thread bush 31, also is convenient for brush holder 8's installation and dismantlement.

Further, referring to fig. 1, as an embodiment of the carbon brush grinding tool for a motor according to the present invention, a locking screw for locking the support rod 3 to prevent the support rod 3 from rotating is further disposed at one end of the support rod 3, and the locking screw radially penetrates through the support rod 3 along the threaded sleeve 31. Through the locking screw, prevent that bracing piece 3 is not hard up, also can guarantee the contact of carbon brush and sliding ring 4.

Further, referring to fig. 1 to 3, as an embodiment of the grinding tool for carbon brushes of a motor according to the present invention, an elastic pressing mechanism for pressing the carbon brushes is respectively disposed on the mounting brackets 81.

Further, referring to fig. 2, as a specific embodiment of the motor carbon brush grinding tool provided by the present invention, the elastic pressing mechanism includes a guide pillar 821 fixedly connected to the mounting bracket 81 and a rotating pressing plate 823 sleeved on the guide pillar 821, a spring 822 is disposed between the rotating pressing plate 823 and the mounting bracket 81, the spring 822 is sleeved on the guide pillar 821, a nut 824 for pressing the rotating pressing plate 823 is disposed at one end of the guide pillar 821 far from the spring 822, and a center line of the guide pillar 821 is perpendicular to a tangent line of an outer circumferential surface of the slip ring 4. Through the spring 822, the carbon brush is always tangent to the outer surface of the slip ring 4, and the adaptation effect of the polished carbon brush and the on-site slip ring is improved.

The present invention further provides another embodiment of the elastic pressing mechanism, referring to fig. 3, specifically, the elastic pressing mechanism includes a U-shaped groove 825, a guide pillar 821, a spring 822 and a fixed pressing plate 826, two ends of the U-shaped groove 825 are perpendicularly fixed to an outer side of the mounting frame 81, the fixed pressing plate 826 is fixed to one end of the guide pillar 821 and is tangent to a side of the carbon brush away from the slip ring, the other end of the guide pillar 821 penetrates through a bottom of the U-shaped groove 825, the spring 822 is sleeved on the guide pillar 821 and is between the fixed pressing plate 826 and the U-shaped groove 825, and the spring 822 is limited between the fixed pressing plate 826 and the U-shaped groove 825.

Further, referring to fig. 1, as an embodiment of the carbon brush grinding tool for a motor according to the present invention, a base plate 5 for mounting and supporting a front holder 2 and a rear holder 1 is further included. Wherein, the front and back support 1 is installed or welded on the bottom plate 5, so that the support is stable and reliable, the bottom plate 5 is made of carbon steel, and the anti-skid rubber layer is laid at the bottom of the bottom plate 5, so as to prevent the movement in the use process.

Further, referring to fig. 1, as an embodiment of the carbon brush grinding tool for a motor according to the present invention, two brush holders 8 are provided on the support rod 3, and since the size of the slip ring provided by the present invention is the same as that of a slip ring matched on site, the brush holder 8 installed on the support rod 3 may be determined according to the length of the slip ring. Of course, the length of the slip ring provided by the invention can be longer than that of the slip ring matched with the motor, and the slip ring has the same diameter, so that a plurality of brush holders 8 can be additionally arranged on the supporting rod 3, more carbon brushes can be polished at one time, and the polishing efficiency is improved.

Referring to fig. 1 to 3, the brush holder 8 further includes an elastic split ring 83 sleeved with the support rod 3, an opening of the elastic split ring 83 protrudes outward to form a connection portion, two connection portions are provided with threaded holes, the brush holder 8 is tightly connected with the support rod 3 through bolts 84 penetrating through the threaded holes, the threaded holes can be through holes, the bolts 84 penetrate through the through holes and are locked by nuts 824, when the brush holder 8 needs to be adjusted, the nuts 824 or the bolts 84 are loosened, and then the brush holder 8 is rotated, so that the carbon brush on the brush holder 8 is kept in a tangential state with the slip ring.

The use method of the grinding tool provided by the invention comprises the following steps:

installing a carbon brush, and enabling the bottom of the carbon brush to be tangent to the abrasive paper on the surface of the slip ring;

uniformly rotating the handle 6 in one direction to enable the slip ring to rotate at a constant speed, polishing the bottom of the carbon brush by abrasive paper, stopping rotating after polishing the carbon brush to a required radian, and taking the carbon brush out of the mounting rack 81;

and after the field RAM generator is stopped, detaching the field old carbon brush, putting the newly polished carbon brush into the field brush holder 8, checking whether the radian of the new carbon brush is matched with the surface radian of the slip ring of the field RAM generator and whether the new carbon brush is in close contact with the slip ring, if the radian of the new carbon brush is not ideal, re-installing the carbon brush and polishing until the carbon brush is polished to be qualified.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. Motor carbon brush burnisher, its characterized in that: the carbon brush polishing device comprises a front support, a rear support and a rotating shaft, wherein the rotating shaft is supported between the front support and the rear support and is rotatably connected with the front support and the rear support, a sliding ring used for polishing a carbon brush is installed on the rotating shaft, a supporting rod parallel to the rotating shaft is fixedly arranged on the front support and/or the rear support, at least one brush holder used for installing the carbon brush is arranged on the supporting rod, the brush holder comprises two installation frames which are opened towards the sliding ring at 90 degrees, and each installation frame is respectively provided with a carbon brush tangent to the outer circumferential surface of the sliding ring; and each mounting rack is provided with an elastic pressing mechanism for pressing the carbon brush.

2. A motor carbon brush grinding tool as claimed in claim 1, wherein: and a layer of sand paper for polishing the carbon brush is arranged on the outer circumferential surface of the slip ring.

3. A motor carbon brush grinding tool as claimed in claim 1, wherein: the slip ring is a plastic part.

4. A motor carbon brush grinding tool as claimed in claim 1, wherein: and one end of the rotating shaft is provided with a handle for rotating the rotating shaft.

5. A motor carbon brush grinding tool as claimed in claim 1, wherein: the front support or be equipped with the thread bush on the after-poppet, the one end of bracing piece be equipped with thread bush screw-thread fit's external screw thread, the bracing piece with thread bush threaded connection.

6. A motor carbon brush grinding tool as claimed in claim 5, wherein: one end of the supporting rod is further provided with a locking screw used for locking the supporting rod to prevent the supporting rod from rotating, and the locking screw penetrates through the threaded sleeve in the radial direction to tightly screw the supporting rod.

7. A motor carbon brush grinding tool as claimed in claim 6, wherein: the elastic pressing mechanism comprises a guide pillar fixedly connected with the mounting frame and a rotary pressing plate sleeved on the guide pillar, a spring is arranged between the rotary pressing plate and the mounting frame and sleeved on the guide pillar, a nut used for pressing the rotary pressing plate is arranged at one end, far away from the spring, of the guide pillar, and the center line of the guide pillar is perpendicular to the tangent line of the outer circumferential surface of the slip ring.

8. A motor carbon brush grinding tool as claimed in claim 1, wherein: the rear support is used for supporting the front support and the rear support.

9. A motor carbon brush grinding tool as claimed in any one of claims 1 to 8, wherein: the supporting rod is provided with two brush holders.