阅读说明：本技术 一种汽轮发电机集电环现场车修装置及工艺 (On-site vehicle repairing device and process for collecting ring of steam turbine generator ) 是由 张辉 李良 章浩 蒋乐鑫 刘崇德 于 2020-11-30 设计创作，主要内容包括：本发明公开一种汽轮发电机集电环现场车修装置及其工艺,包括刀座底架和刀具,所述刀座底架设置于汽轮发电机的底板平台上且刀座底架的轴向进给方向相对于转子轴线的平行滑动,所述刀具设置于所述刀座底架上且通过垫刀板并相对于转子轴心线上下调整；本发明不需要拆装机以及返厂车修集电环,能极大的缩短维修停机时间,减少停机时的经济损失。(The invention discloses a field vehicle repair device and a process for a collecting ring of a turbonator, and the field vehicle repair device comprises a tool apron underframe and a tool, wherein the tool apron underframe is arranged on a bottom plate platform of the turbonator, the axial feeding direction of the tool apron underframe slides in parallel relative to the axis of a rotor, and the tool is arranged on the tool apron underframe and is adjusted up and down relative to the axis of the rotor through a tool padding plate; the invention does not need a dismounting machine and returns to a factory vehicle to repair the slip ring, can greatly shorten the maintenance downtime and reduce the economic loss during the shutdown.)

1. The utility model provides a device is repaiied to on-spot car of turbonator collecting ring, its characterized in that, includes blade holder chassis (1), cutter (2), knife rest (3) and generator base platform (4), blade holder chassis (1) set up on turbonator's bottom plate platform (4) and the axial direction of feed of blade holder chassis (1) slide for the parallel of rotor axis, knife rest (3) set up in on the knife rest base (1), cutter (2) set up in on knife rest (3) and through the pad cutting board and adjust from top to bottom for the rotor axial lead.

2. The on-site vehicle repairing device for the collecting ring of the turbonator according to claim 1, wherein the joint of the upper plane of the tool apron underframe (1) and the tool rest (3) is provided with two arc-shaped grooves.

3. The on-site vehicle repair device for the collecting ring of the turbonator according to claim 2, wherein the tool apron underframe (1) is of a box structure and is internally provided with a hollow accommodating chamber, and the bottom of the tool apron underframe (1) is positioned and fixed through a screw hole and a bolt on one side of the generator bottom plate platform (4).

4. The on-site car repairing device for the collecting ring of the turbonator according to claim 1, wherein the cutter (2) extends 50-60 mm relative to the cutter rest (3); the cutting tool (2) comprises a tool bit (21) and a tool bar (22), wherein the tool bit (21) is made of M-type alloy, and the tool bar is made of No. 45 steel.

5. The on-site vehicle repairing device for the collecting ring of the turbonator according to claim 4, wherein the front angle of the cutter head (21) is 6-8 degrees, the rear angle is 10-12 degrees, and the cutter tip angle is 140 degrees.

6. The on-site repairing device for the collecting ring of the turbonator according to claim 4, wherein the cutter bar (22) is a rectangular cutter bar with the sectional area of 32 x 20, and the material of the cutter bar (22) is 45-grade steel.

7. A turbo generator collecting ring on-site vehicle repair process is characterized in that a tool apron underframe is arranged on a bottom plate platform of a turbo generator, the axial feeding direction of the tool apron underframe slides in parallel relative to the axis of a rotor, a tool rest is arranged on the tool rest base, and a tool is arranged on the tool rest and is adjusted up and down relative to the axis of the rotor through a tool padding plate; when the vehicle is repaired, the method comprises the following steps:

s1, adjusting the parallelism of the axial feeding direction of the tool apron underframe and the axial lead of the rotor;

s2, selecting cutting parameters including cutting speed, feed and cutting depth;

and S3, filing the burr.

8. The on-site turning and repairing process of the collecting ring of the turbonator according to claim 7, wherein in step S1, when the parallelism between the axial feeding direction of the tool apron underframe and the axial lead of the rotor is adjusted, two arc-shaped grooves are milled at the joint of the upper plane of the tool apron underframe and the tool rest, the tool rest is screwed after rough adjustment is carried out to a proper position, then the dial indicator is fixed on the tool rest, the indicator head points to the smooth rotor axial surface or the collecting ring surface, the small sliding plate arranged at the bottom of the tool apron underframe is moved to move axially on the generator base platform, and the fastening bolt is added after the value is adjusted to a proper position according to the dial indicator; the height of the axial lead of the cutter and the rotor is adjusted by cushioning the cutter plate at different positions on the bottom surface of the cutter.

9. The field vehicle repairing process of the collecting ring of the turbonator according to claim 7, wherein the rotation of the main motion is realized by driving a generator rotor to rotate by virtue of a turbine rotor, 3000r/min and 40r/min are respectively carried out when the turbine is normally started, and the corresponding cutting speeds are 4239m/min and 56.52 m/min; the feeding amount is selected to be 0.5 mm/r-1.2 mm/r; the single cut depth was 0.5 mm.

10. The on-site turning process of the collecting ring of the steam turbine generator as claimed in claim 7, wherein after turning, the burrs on the side of the square tooth spiral groove on the surface of the collecting ring are filed by a file, then the steam turbine unit is turned to 3000r/min at normal start-up, the surface of the collecting ring is ground by wrapping a flat file with a zero-grade abrasive cloth, and finally the surface is polished by polishing abrasive paper.

Technical Field

The invention relates to the technical field of collecting rings of turbonators, in particular to a field vehicle repair device and process for collecting rings of turbonators.

Background

In the running process of the generator set, mechanical abrasion caused by relative motion between the carbon brush and the collecting ring and electrical abrasion and electrical corrosion under the action of current easily cause damage to the surface of the collecting ring in different degrees. The ignition phenomenon between the carbon brush and the current collecting ring can be caused lightly, and the short circuit can be caused seriously, thereby influencing the safety of the whole unit. When the surface of the collecting ring is only slightly abraded, the collecting ring can be used after being polished by using oilstone or fine files and then being polished by using proper abrasive paper. However, if the surface of the collecting ring is seriously abraded, if the abrasion depth exceeds 1mm and the abrasion area reaches 25% of the total area, the collecting ring needs to be replaced or the surface of the collecting ring needs to be polished after being car-repaired. Most generator enterprises do not have large lathes and generally need to return to the factory for processing. But the returning treatment cost is high, the period is long, the downtime is long, and the economic benefit and the social benefit of the power plant are seriously influenced.

Disclosure of Invention

The invention aims to provide a device and a process for repairing a collecting ring of a turbonator on site without disassembling and repairing the collecting ring on site, which aim to solve the problems that the surface of the existing collecting ring provided by the background technology is seriously worn, and when the worn area reaches 25 percent of the total area, the collecting ring needs to be replaced or the surface of the collecting ring needs to be polished after being repaired.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a field vehicle repairing device for a collecting ring of a turbonator, which comprises a tool apron underframe, a tool rest and a generator base platform, wherein the tool apron underframe is arranged on a bottom plate platform of the turbonator, the axial feeding direction of the tool apron underframe slides in parallel relative to the axis of a rotor, the tool rest is arranged on the tool rest base, and the tool is arranged on the tool rest and is adjusted up and down relative to the axis of the rotor through a tool padding plate.

As a further improvement of the scheme, two arc-shaped grooves are formed in the joint of the upper plane of the cutter holder underframe and the cutter holder.

As a further improvement of the scheme, the tool apron underframe is of a box structure, a hollow accommodating chamber is formed in the tool apron underframe, and the bottom of the tool apron underframe is positioned and fixed through a screw hole and a bolt on one side of a platform of the generator bottom plate.

As a further improvement of the scheme, the cutter comprises a cutter head and a cutter bar, wherein the cutter head is made of M-type alloy, and the cutter bar is made of steel.

As a further improvement of the scheme, the front angle of the tool bit is 6-8 degrees, the rear angle is 10-12 degrees, and the tool tip angle is 140 degrees.

As a further improvement of the scheme, the cutter bar is a rectangular cutter bar with the sectional area of 32 multiplied by 20, and the cutter bar is made of No. 45 steel.

As a further improvement of the scheme, the cutter extends 50-60 mm relative to the cutter frame.

The invention also provides a field vehicle repair process for a collecting ring of a turbonator, wherein a tool apron underframe is arranged on a bottom plate platform of the turbonator, the axial feeding direction of the tool apron underframe slides in parallel relative to the axis of a rotor, a tool rest is arranged on the tool rest base, and a tool is arranged on the tool rest and is vertically adjusted relative to the axis of the rotor through a tool padding plate; when the vehicle repairing process is carried out, the method comprises the following steps:

s1, adjusting the parallelism of the axial feeding direction of the tool apron underframe and the axial lead of the rotor;

s2, selecting cutting parameters including cutting speed, feed and cutting depth;

and S3, filing the burr.

As a further improvement of the technical scheme, when the parallelism of the axial feeding direction of the tool apron underframe and the axial lead of the rotor is adjusted, two arc-shaped grooves are milled at the joint of the upper plane of the tool apron underframe and the tool rest respectively, after the arc-shaped grooves are roughly adjusted to a proper position, bolts of the tool rest are screwed, then the dial indicator is fixed on the tool rest, the indicator head points to the smooth axial surface of the rotor or the surface of the collector ring, a small sliding plate arranged at the bottom of the tool apron underframe is moved to move axially on a platform of a generator base, and after the parallelism is adjusted to a proper position according to the indication value of the dial indicator, the bolts are fastened; the height of the axial lead of the cutter and the rotor is adjusted by cushioning the cutter plate at different positions on the bottom surface of the cutter.

As a further improvement of the technical scheme, the rotation of the main movement is realized by driving a generator rotor to rotate by a turbine rotor, and when the turbine is normally started up, 3000r/min and 40r/min when turning is carried out, the corresponding cutting speeds are 4239m/min and 56.52m/min respectively; the feed rate is 0.5 mm/r-1.2 mm/r, and the single cutting depth is 0.5 mm.

As a further improvement of the technical scheme, after the turning and trimming, the burrs on the side of the square tooth spiral groove on the surface of the collector ring are filed by a file, then the turbine unit is rotated to 3000r/min when being started normally, a flat file is wrapped by a zero-grade abrasive cloth to grind the surface of the collector ring, and finally, polishing is carried out by polishing abrasive paper.

Compared with the prior art, the invention has the beneficial effects that: the disassembly and assembly machine and the factory returning vehicle are not needed for repairing the slip ring, so that the maintenance downtime can be greatly shortened, and the economic loss during the shutdown is reduced.

The process can completely meet the requirements of geometric tolerance and surface roughness of the collecting ring in design drawings through field practical use. Through on-the-spot actual measurement, can reach after the car is repaiied: surface roughness Ra0.8, parallelism 0.02, cylindricity 0.02.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure of the cutter of the present invention;

FIG. 3 is a view for calculating the extension of the cutter according to the present invention.

In the drawings: 1 is a tool apron chassis, 2 is a tool, 3 is a tool rest, 4 is a generator bottom plate platform, 21 is a tool bit, and 22 is a tool bar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the invention provides a field vehicle repair device and a process method for a collecting ring of a turbonator, and the device specifically comprises a tool apron underframe 1, a tool 2, a tool rest 3 and a generator base platform 4, wherein the tool apron underframe 1 is arranged on the base plate platform 4 of the turbonator, the axial feeding direction of the tool apron underframe 1 slides in parallel relative to the axis of a rotor, the tool rest 3 is arranged on the tool rest base 1, and the tool 2 is arranged on the tool rest 3 and is adjusted up and down relative to the axis of the rotor through a tool padding plate. When the parallelism of the axial feeding direction of the tool apron underframe 1 and the axial lead of the rotor is adjusted, two arc-shaped grooves are milled at the joint of the upper plane of the tool apron underframe 1 and the tool rest 3 respectively, after the arc-shaped grooves are roughly adjusted to a proper position, bolts of the small tool rest are screwed, then the dial indicator is fixed on the tool rest 3, the indicator head points to the smooth axial surface of the rotor or the surface of the current collecting ring, the small sliding plate arranged at the bottom of the tool apron underframe 1 is moved to move axially on the platform 4 of the generator base, and after the parallelism is adjusted to a proper position according to the indication value of the dial indicator, the bolts are fastened; when the height of the cutter 2 and the axial lead of the rotor is adjusted, the cutter is padded at different positions on the bottom surface of the cutter by a cutter pad.

The realization of the cutting motion during the specific turning and repairing is divided into two aspects of the realization of axial feeding and the realization of radial feeding. The axial feeding is realized by uniformly rotating the handle of the small carriage of the tool rest 3 by both hands. The control of radial feeding can be realized through fine-thread transmission with the thread pitch of 1mm, and the specific method is that a nut is clamped on a tool rest 3, a screw rod is propped against the back of a cutter 2, the screw rod is rotated, the cutter can be propped forwards by 1mm by utilizing the rotation of the screw rod and the nut, the lever dial indicator can be propped against the back of the cutter for accurate control, and the rotary feeding and the adjustment are carried out according to the indicating value of the dial indicator.

The base frame 1 of the tool apron is made of common carbon steel, such as Q235 steel plate. When the tool apron underframe 1 is used, a Q235 steel plate is welded into a box body, the middle part is hollowed to reduce the weight, front legs of vertical plates on two sides are lengthened to increase the stability of the tool apron underframe 1, then auxiliary components and sundries between a collecting ring and a generator bottom plate platform are removed, holes are drilled in the proper position of a bottom plate of the tool apron underframe 1, so that the holes and bolts on one side of a generator bottom plate platform 4 are used for positioning and fixing, and other parts are spot-welded on a unit platform, so that the tool apron underframe 1 is light, firm and reliable.

In the above embodiment, the material of the collector ring is 35SiMn, so that under the pressure of the brush holder and the friction of the carbon rod, a wear-resistant hardened layer can be rapidly formed on the surface of the collector ring, and meanwhile, the surface of the collector ring is provided with square threads which are beneficial to heat dissipation, so that the cutting process in the process of repairing the collector ring is intermittent cutting. The cutter 2 comprises a cutter head 21 and a cutter bar 22, according to the characteristics of the collector rings, the cutter head 21 is made of a material with high hardness, wear resistance, impact resistance and hot hardness, the cutter head 21 is preferably made of an M-type alloy and has good bending strength, impact toughness and heat resistance and wear resistance, and Yw1 and Yw2 in the M-type hard alloy can be used as the cutter head material of the cutter head 21. The angle of the cutting insert 21 is selected in consideration of the sharpness, impact resistance and chip removal of the tool, and the surface roughness after machining. Therefore, the front angle of the tool bit 21 is 6-8 degrees, the back angle is 10-12 degrees, and the tool tip angle is 140 degrees, which is characterized in that the tool tip is sharp and impact-resistant, the chip removal is smooth, the chip breaking is good, the surface quality after processing is high, and meanwhile, the tool bit 21 can be sharpened into a double transition edge, a double smoothing edge and a double chip breaking groove in consideration of the difficulty in on-site sharpening; the cutter bar 22 is a rectangular cutter bar with the sectional area of 32 multiplied by 20, and the cutter bar is made of No. 45 steel.

In the above embodiment, in order to enhance the rigidity of the cutter bar 22 and avoid the cutter head from being stuck by an external force during machining, the base of the cutter holder should be as close to the slip ring as possible, and the extension length of the cutter bar should be shortened. The shorter the length of the tool shank 22 is extended, the more rigid the tool bit 21 is, the less the tool is caught, and the better the surface roughness after the cutting work is finished. During the in-service use, because the relevant part on the generator rotor is more, knife rest base 1 can not be nearer to the collecting ring, and when the actual measurement car was repaiied the generator collecting ring according to the scene, cutter 2 need stretch out 50 ~ 60 millimeters.

In the above embodiments, the selection of the cutting parameters is divided into the selection of the cutting speed, the selection of the feed amount, and the selection of the cutting depth. The rotation of the main movement can be realized only by driving the generator rotor to rotate by the turbine rotor, the turbine has only two rotating speeds, 3000r/min during normal start-up and 40r/min during turning, and the corresponding cutting speeds are 4239m/min and 56.52m/min respectively. Because the cutting speed is too high during normal starting and is not suitable for cutting processing, and the cutting speed cutter can accept during turning, only the cutting speed corresponding to the rotating speed during turning can be selected. The feeding amount is 0.5 mm/r-1.2 mm/r, and the axial feeding is realized by rotating the handle of the small tool rest, so that the feeding amount is not easy to control, the tool rest rotates at a slower, uniform and consistent rotating speed, and the uniformity and consistency of the movement of the tool are ensured. The cutting depth is generally selected according to the wear condition of the collector ring, and the single cutting depth is controlled to be 0.5mm, so that the worn part on the surface of the collector ring can be trimmed and flattened.

After the turning and trimming, firstly using a file to file burrs on the side of a square tooth spiral groove on the surface of the collecting ring, then opening the turbine unit at a rotating speed of 3000r/min when the turbine unit is normally started, using a zero-grade abrasive cloth to wrap a flat file to grind the surface of the collecting ring, and finally using polishing abrasive paper to polish the surface of the collecting ring to the surface roughness required by the drawing standard.

In the above embodiment, the safety threshold for tool extension is calculated as: the tangential cutting force F is 200N, the shank diameter D is 20mm, and the extension length L is 60 mm. The elastic modulus E of the shank material (steel No. 45) was 210 GPa. The tool bar can be converted into a cantilever beam deflection calculation. The equation of column bending moment is taken, a coordinate system xAy is shown in figure 2, and the equation of bending moment of the beam is

M(x)＝-F(l-x)＝F(x-l)(1)

The deflection line approximates a differential equation of

EI_zv″＝M(x)＝F(x-l)(2)

Is integrated to obtain

Boundary condition v at fixed end_x＝0Substituting 0 into formula (3) to obtain C0, D0, and substituting 0 into formula (3) to obtain the beam bending line equation

Obtaining the deflection by calculating the B section and substituting x as l

F200N, E210 Gpa, D20 mm, l 60mm, IZ 7850mm4 are substituted to obtain v 0.0085mm and 0.01 mm. The calculation result shows that when the cutter extends by 60mm and the cutting edge is subjected to a downward cutting force of 200N, the cutter rod needs to be bent and deformed by 0.01mm downwards, and the cutter is not pricked to influence the surface quality in the actual cutting process. And the problem of knife binding can be solved by adjusting the cutting depth and the feeding amount in the actual processing.

The process can completely meet the requirements of geometric tolerance and surface roughness of the collecting ring in design drawings through field practical use. Through on-the-spot actual measurement, can reach after the car is repaiied: surface roughness Ra0.8, parallelism 0.02, cylindricity 0.02.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.