阅读说明：本技术 汽轮发电机轴承翻瓦方法 (Bearing turning method for turbonator ) 是由 苑令辉 任锋 王德朝 王铁超 张亚辉 周功林 孙永刚 杨秀武 贾凯利 王进 高国 于 2021-07-23 设计创作，主要内容包括：本发明公开了一种汽轮发电机轴承翻瓦方法,包括以下步骤：S1、在拆除轴承上半后,安装半圆的翻转支架和牵引装置；S2、将牵引装置的牵引绳引出,沿着翻转支架的一端从轴承下半一侧的中分面进入并绕过轴承下半的外表面后,从轴承下半另一侧的中分面伸出并连接在翻转支架的另一端上；S3、将转子抬高预定高度,使轴承下半与其下方的瓦枕脱离；S4、启动牵引装置,回收牵引绳,拉动轴承下半向上翻转,直至轴承下半翻转至上方,翻转支架翻转至下方。本发明的汽轮发电机轴承翻瓦方法,实现在不拆除发电机大端盖上半的情况下,通过翻转支架与轴承下半连接,再通过安装在大端盖内顶部的牵引牵引装置将轴承下半翻出,安全可靠、高效便捷。(The invention discloses a bearing turning method for a turbine generator bearing, which comprises the following steps: s1, after the upper half of the bearing is removed, installing a semicircular overturning bracket and a traction device; s2, leading out a traction rope of the traction device, entering from the middle plane of one side of the lower half of the bearing along one end of the overturning bracket, and extending out from the middle plane of the other side of the lower half of the bearing after bypassing the outer surface of the lower half of the bearing, and connecting to the other end of the overturning bracket; s3, lifting the rotor by a preset height to separate the lower half of the bearing from the tile pillow below the lower half of the bearing; and S4, starting the traction device, recovering the traction rope, pulling the lower half of the bearing to turn upwards until the lower half of the bearing turns over to the upper side, and turning the support to the lower side. The method for turning the bearing of the turbogenerator bearing disclosed by the invention realizes that the lower half of the bearing is connected with the lower half of the bearing through the turning support under the condition that the upper half of the large end cover of the turbogenerator is not detached, and then the lower half of the bearing is turned out through the traction device arranged at the inner top of the large end cover, so that the method is safe, reliable, efficient and convenient.)

1. A method for turning bearing tiles of a steam turbine generator is characterized by comprising the following steps:

s1, after the upper half of the bearing is removed, an arched overturning bracket and a traction device are installed;

wherein, a semicircular overturning bracket is matched above the rotor and fixedly connected to the middle section surface of the lower half of the bearing; installing a traction device on the inner top of a large end cover of the generator above the overturning bracket;

s2, leading out a traction rope of the traction device, entering from the middle plane of one side of the lower half of the bearing along one end of the overturning bracket, and extending out from the middle plane of the other side of the lower half of the bearing after bypassing the outer surface of the lower half of the bearing, and connecting to the other end of the overturning bracket;

s3, lifting the rotor to a preset height to separate the lower half of the bearing from a tile pillow below the lower half of the bearing;

and S4, starting the traction device, recovering the traction rope, pulling the lower half of the bearing to turn upwards until the lower half of the bearing turns over to the upper side, and turning the turning support to the lower side.

2. The method of claim 1, wherein the traction device comprises a manual tractor;

in step S4, when the traction apparatus is activated, the handle is inserted into the ratchet of the manual retractor, and the traction rope is recovered by rotating the handle.

3. The method of claim 1, wherein the turn-over stand comprises two support plates, a gantry coupled between the two support plates, at least one roller disposed within the gantry; the peripheral surface of the roller is protruded to the inner side of the arched frame and can rotate relative to the arched frame;

in step S1, when the turning bracket is mounted, the two support plates are respectively fitted on the bisection planes on the lower half of the bearing and connected to the bisection planes through fastening components; the arched frame is matched on the periphery of the rotor and is in rolling contact with the peripheral surface of the rotor through the rollers.

4. A method of turn-tiling a bearing of a turbine generator according to claim 3, wherein each of said support plates is provided with at least two attachment holes; when the turnover support is installed, the supporting plates are respectively matched on the bisection surfaces at the two sides of the lower half of the bearing, and the connecting holes in the supporting plates are oppositely communicated with the corresponding screw holes in the bisection surfaces; and a fastening component is penetrated and locked in the connecting hole and the screw hole which are communicated oppositely, and the supporting plate is locked on the corresponding median plane.

5. A method of turn-tiling a bearing of a turbine generator as claimed in claim 3, wherein said support plate is provided with engaging lugs;

in step S2, the pulling rope is hooked on the engaging lug of the supporting plate at the other end of the turning bracket after passing around the lower half of the bearing along one end of the turning bracket.

6. The method of turn-up of a bearing of a steam turbine generator as claimed in any one of claims 1 to 5, wherein the method of turn-up of a bearing of a steam turbine generator further comprises the steps of:

and S5, releasing the connection between the overturning bracket and the middle split surface of the lower half of the bearing, and hanging out the lower half of the bearing.

7. The method of claim 6, further comprising the steps of:

s6, fitting a hoop above the rotor and fixedly connecting the hoop with the overturning bracket;

s7, leading out a traction rope of the traction device, entering along one end of the hoop, bypassing the overturning bracket, and connecting to the other end of the hoop;

s8, starting the traction device, recovering the traction rope, pulling the overturning bracket to overturn upwards until the overturning bracket overturns to the upper side of the rotor, and overturning the hoop to the lower side of the rotor;

and S9, removing the connection between the turnover bracket and the hoop, lifting the turnover bracket out, and taking out the hoop.

8. The method of claim 7, wherein prior to step S5, the inverted lower bearing half is protectively positioned and the draft gear is removed.

9. The method for turning over bearing shell of steam turbine generator as claimed in claim 8, wherein said traction device is installed on the inner top of the large end cover of the generator before step S7.

10. The method of claim 7 wherein the anchor ears are made of a lightweight material and have a weight less than the weight of the roll-over stand.

Technical Field

The invention relates to the technical field of electronic cigarettes, in particular to a bearing turning method for a steam turbine generator.

Background

In the case of a rotary machine, bearings, which are classified into a rolling bearing and a sliding bearing, support a rotating member, maintain rotational accuracy, and reduce wear of the rotating member. For a turbonator, the bearing has the characteristics of high speed, heavy load, high precision requirement, strong continuous operation capability, high overhauling difficulty, structural requirement, and the like, so that the turbonator bearing adopts a sliding bearing based on a fluid dynamic pressure lubrication theory. The mounting and the dismounting of the sliding bearing are often involved in the mounting and the overhauling processes of the turbonator. For example, in the process of disassembling the half-section sliding bearing, firstly, a positioning pin and a fastening bolt of a middle section of the bearing need to be disassembled, then, the upper half bearing is disassembled, and finally, the lower half bearing is disassembled. However, the overhaul period of the turbine generator bearing is shorter than that of the main body equipment, and the rotor is not lifted when the lower half bearing is disassembled, so that the lower half bearing needs to be rotated 180 degrees along the journal so as to be lifted conveniently.

For the current million kilowatt steam turbine generator unit, a single rotor weighs hundreds of tons or even more than two hundred tons, and it is unrealistic to directly turn over the lower half bearing which is bearing the weight of the rotor, so the rotor needs to be lifted to a certain height in advance, and the lower half bearing does not bear the weight any more. However, even if the weight of the lower half bearing is not negligible, for example, after the rotor is separated from the lower half bearing, the lower half bearing is directly turned over, which is very easy to cause friction damage between the bottom of the lower half bearing and the bearing pad, and the phenomenon of scratch or galling will occur in severe cases.

Taking a QFSN-1100-4 type 1100MW half-speed generator of Siemens as an example, the upper half end cover of the generator needs to be removed in advance before the lower half bearing of the generator is detached in the traditional process, then the rotor of the generator is lifted to a certain height, then a travelling crane hanging sling pocket is utilized to hang one side of the middle section of the lower half bearing, a sling is led out from the middle section of the other side by bypassing the lower half bearing, and finally the sling is pulled slowly to drive the lower half bearing to rotate 180 degrees around the rotor. The traditional tile turning process needs to remove the upper half of a large end cover of a generator, remove a shaft sealing device of the generator in a connecting way and unfasten a steam turbine-generator pair wheel, and can generate a critical path construction period of nearly 200 hours and a large amount of maintenance cost.

At present, the turning of the bearing bush is completed before the upper half of the large end cover is removed during F202 overhaul of the same type of units in the industry, the mode is that a lifting ring is installed by utilizing a bolt hole in the large end cover to turn, lifting points are gradually changed by combining the position and the gravity center of the bearing bush, and finally the lower half of the bearing bush is turned out. The tile turning process has the advantages that the risk is very high, the turning point of the hanging strip is a sharp right angle, the dead weight of the lower half bearing bush of the generator is large, and the bottom of the bearing bush cannot be separated from the bearing bush in the tile turning process, so that the hanging strip is required to be pulled and pulled to be inclined and pulled out of the lower half of the bearing bush under the condition that the hanging strip is threatened.

Disclosure of Invention

The invention aims to provide a safe, reliable, efficient and convenient method for turning bearing tiles of a turbine generator bearing.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for turning bearing tiles of a steam turbine generator is provided, which comprises the following steps:

s1, after the upper half of the bearing is removed, an arched overturning bracket and a traction device are installed;

wherein, a semicircular overturning bracket is matched above the rotor and fixedly connected to the middle section surface of the lower half of the bearing; installing a traction device on the inner top of a large end cover of the generator above the overturning bracket;

s2, leading out a traction rope of the traction device, entering from the middle plane of one side of the lower half of the bearing along one end of the overturning bracket, and extending out from the middle plane of the other side of the lower half of the bearing after bypassing the outer surface of the lower half of the bearing, and connecting to the other end of the overturning bracket;

s3, lifting the rotor to a preset height to separate the lower half of the bearing from a tile pillow below the lower half of the bearing;

and S4, starting the traction device, recovering the traction rope, pulling the lower half of the bearing to turn upwards until the lower half of the bearing turns over to the upper side, and turning the turning support to the lower side.

Preferably, the traction means comprises a manual tractor;

in step S4, when the traction apparatus is activated, the handle is inserted into the ratchet of the manual retractor, and the traction rope is recovered by rotating the handle.

Preferably, the turning bracket comprises two support plates, a gantry connected between the two support plates, and at least one roller arranged in the gantry; the peripheral surface of the roller is protruded to the inner side of the arched frame and can rotate relative to the arched frame;

in step S1, when the turning bracket is mounted, the two support plates are respectively fitted on the bisection planes on the lower half of the bearing and connected to the bisection planes through fastening components; the arched frame is matched on the periphery of the rotor and is in rolling contact with the peripheral surface of the rotor through the rollers.

Preferably, each support plate is provided with at least two connecting holes; when the turnover support is installed, the supporting plates are respectively matched on the bisection surfaces at the two sides of the lower half of the bearing, and the connecting holes in the supporting plates are oppositely communicated with the corresponding screw holes in the bisection surfaces; and a fastening component is penetrated and locked in the connecting hole and the screw hole which are communicated oppositely, and the supporting plate is locked on the corresponding median plane.

Preferably, the support plate is provided with a connecting lug;

in step S2, the pulling rope is hooked on the engaging lug of the supporting plate at the other end of the turning bracket after passing around the lower half of the bearing along one end of the turning bracket.

Preferably, the method of turn-up of a bearing of a steam turbine generator further comprises the steps of:

and S5, releasing the connection between the overturning bracket and the middle split surface of the lower half of the bearing, and hanging out the lower half of the bearing.

Preferably, the method of turn-up of a bearing of a steam turbine generator further comprises the steps of:

s6, fitting a hoop above the rotor and fixedly connecting the hoop with the overturning bracket;

s7, leading out a traction rope of the traction device, entering along one end of the hoop, bypassing the overturning bracket, and connecting to the other end of the hoop;

s8, starting the traction device, recovering the traction rope, pulling the overturning bracket to overturn upwards until the overturning bracket overturns to the upper side of the rotor, and overturning the hoop to the lower side of the rotor;

and S9, removing the connection between the turnover bracket and the hoop, lifting the turnover bracket out, and taking out the hoop.

Preferably, before step S5, the inverted lower bearing half is protected and positioned, and the traction device is detached.

Preferably, before step S7, the traction device is installed on the top inside the large end cover of the generator.

Preferably, the hoop is made of light materials, and the weight of the hoop is smaller than that of the overturning bracket.

The method for turning the bearing of the turbogenerator bearing disclosed by the invention realizes that the lower half of the bearing is connected with the lower half of the bearing through the turning support under the condition that the upper half of the large end cover of the turbogenerator is not detached, and then the lower half of the bearing is turned out through the traction device arranged at the inner top of the large end cover, so that the method is safe, reliable, efficient and convenient. The traction device is characterized in that the traction rope of the traction device directly bypasses the lower half of the bearing inside the large end cover, and a right-angled turning point is bypassed without extending out of the large end cover, so that the risk of askew pulling and inclined lifting and the risk of equipment damage are eliminated, and the safety is improved.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of a bearing in the present invention when the bearing is turned (the bearing shoe is not shown);

FIG. 2 is a front view of a turbine generator bearing in accordance with the present invention when the bearing is tipped;

FIG. 3 is a top view of a turbine generator bearing in accordance with the present invention with the large end cap omitted;

fig. 4 is a schematic structural view of the roll-over stand according to the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

The method for turning the bearing bush of the turbine generator bearing is used for turning the lower half (also called the bearing bush) of the bearing out to the upper part of a rotor under the condition that the upper half of a large end cover does not need to be removed.

As shown in fig. 1-3, the method for turning over bearing of a turbine generator according to an embodiment of the present invention may include the following steps:

s1, after removing the upper half of the bearing, installing the arched inversion bracket 20 and the draft gear 30.

The bearing is integrally formed by the mating connection of the upper bearing half and the lower bearing half 40. The removal of the upper half of the bearing is achieved by the prior art.

Wherein, the semi-circle turning bracket 20 is arranged at the position of the upper half of the original bearing, and the turning bracket 20 is matched above the rotor 50 and fixedly connected on the middle split surface of the lower half 40 of the bearing.

As shown in fig. 4, the tilt frame 20 includes two support plates 21, a gantry 22 connected between the two support plates 21, and at least one roller 23 disposed within the gantry 22. Each support plate 21 is provided with at least two coupling holes (not shown) and at least one coupling lug 24. The gantry 22 may be formed by two arc plates that are spaced and opposed to each other and connected to each other, the roller 23 is disposed in a space between the two arc plates, and both ends of the roller 23 in the axial direction are respectively connected to the two arc plates through a rotating shaft, and are rotatable with respect to the two arc plates (i.e., with respect to the entire gantry 22). The outer circumference of the roller 23 projects to the inside of the gantry 22. The rollers 23 are preferably copper rollers.

With reference to fig. 2-4, when the turning bracket 20 is installed, the two support plates 21 are respectively fitted on the bisectors on both sides of the lower bearing half 40, and the connection holes on the support plates 21 are relatively communicated with the screw holes on the corresponding bisectors; the fastening components (including bolts) are inserted into and locked in the connecting holes and the screw holes which are communicated oppositely, and the supporting plate 21 is locked on the corresponding middle section surface. The gantry 22 is fitted to the outer periphery of the rotor 50 and is in rolling contact with the outer peripheral surface of the rotor 50 via rollers 23.

When the traction device 30 is installed, the traction device 30 is installed at the top in the large end cover 10 of the generator above the overturning support 20, and the installation point is the position of the original bearing bush insulating top block, so that the narrow space in the large end cover 10 is fully utilized. In this embodiment, the traction device 30 comprises a manual tractor, which comprises a speed reducer, a torque amplifier, and a ratchet capable of bearing 10000NM torque, and a rope made of kevlar wires is used as the traction rope 31.

And S2, leading out the traction rope 31 of the traction device 30, entering from the middle section of one side of the lower bearing half 40 along one end of the overturning bracket 20, passing through the outer surface of the lower bearing half 40, extending from the middle section of the other side of the lower bearing half 40 and connecting to the other end of the overturning bracket 20.

In the roll-over stand 20, two support plates 21 are located at opposite ends thereof, respectively. Therefore, the pulling rope 31 is hung on the connecting lug 24 of the supporting plate 21 at the other end of the overturning bracket 20 after passing through the lower bearing half 40 along one end of the overturning bracket 20.

S3, the rotor 50 is raised to a predetermined height to separate the lower bearing half 40 from the lower bearing pad.

In step S1, after the inverted bracket 20 is mounted, the connection with the lower bearing half 40 is such that the lower bearing half 40 is held tightly against the rotor 50. When the rotor 50 is raised, the lower bearing half 40 is also raised, so that the lower bearing half 40 can be disengaged from the lower bearing shoe 60, and thus no friction is subsequently generated with the bearing shoe 60 during turning.

S4, starting the traction device 30, recovering the traction rope 31, pulling the lower bearing half 40 to turn upwards until the lower bearing half 40 turns upwards, and turning the support 20 downwards.

In this embodiment, when the traction device 30 is activated, the handle is inserted into the ratchet of the manual retractor and the traction rope 31 is retracted by rotating the handle. The traction rope 31 is retracted along its original path into the manual retractor, and at the same time, drives the turning support 20 connected thereto to turn downward, and the lower bearing half 40 to turn upward.

After the lower bearing half 40 is completely turned over above the rotor 50, the lower bearing half 40 is protected and positioned to prevent the lower bearing half from turning over, and the traction device 30 is disassembled.

And S5, releasing the connection between the turnover support 20 and the split surface of the lower bearing half 40, and hanging the lower bearing half 40 out.

When released, the fastening assembly between the support plate 21 and the corresponding median plane is removed so that the tilting bracket 20 and the lower bearing half 40 are separated. After the bearing lower half 40 is connected through the lifting rigging, the bearing lower half 40 is lifted through the lifting equipment.

S6, a hoop (not shown) is fitted over the rotor 50 and fixedly connected to the turning bracket 20 by fastening members (e.g., bolts, etc.).

The hoop is made of light materials, such as aluminum alloy and the like, and the weight of the hoop is smaller than that of the overturning bracket 20. The hoop may be semicircular, and may form a complete circle structure after being connected to the turning bracket 20, so as to hold the turning bracket 20 tightly on the rotor 50.

The traction device 30 is then installed on top inside the large end cover 10 of the generator.

And S7, leading out the traction rope 31 of the traction device 30, entering along one end of the hoop, bypassing the overturning bracket 20, and then connecting to the other end of the hoop.

The pull cord 31 is routed around the roll-over stand 20 in the same manner as described above around the lower bearing half 40.

S8, starting the traction device 30, recovering the traction rope 31, pulling the overturning bracket 20 to overturn upwards until the overturning bracket 20 overturns above the rotor 50, and overturning the hoop below the rotor 50.

In this embodiment, when the traction device 30 is activated, the handle is inserted into the ratchet of the manual retractor and the traction rope 31 is retracted by rotating the handle. The traction rope 31 is retracted into the manual tractor along the original leading-out path, and simultaneously drives the hoop connected with the traction rope to turn downwards, and the turning support 20 turns upwards.

And S9, removing the connection between the overturning bracket 20 and the hoop, lifting the overturning bracket 20 out, and taking out the hoop.

According to the method, the lower half 40 of the bearing is turned out efficiently and conveniently, compared with the traditional tile turning process, the upper half of the large end cover 10 of the generator is prevented from being detached, the shaft sealing device of the generator is detached, the steam turbine-generator pair wheel is unfastened, and the key path construction period and a large amount of maintenance cost of nearly 200 hours are saved; the traction device 30 is used for traction in the large end cover 10 to realize tile turning, the risk of inclined pulling and inclined hanging and the risk of equipment damage are eliminated, precious driving resources for at least 12 hours are released, and the intrinsic safety is improved.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.