A dismounting device for dismounting and mounting a bearing of a gas turbine

Abstract

The present application belongs to the technical field of gas turbine, and particularly relates to a dismounting equipment for dismounting and mounting a bearing of a gas turbine, which comprises a shaft head structure and a dismounting tool, the shaft head structure comprises a thrust disc and a main shaft connected with the thrust disc, and the rear end of the thrust disc is connected with a thrust radial combined bearing; the dismounting tool comprises a fixing support, a cross beam guide rail, a travelling crane, a connecting plate and a counterweight support, the fixing support is used for being connected with the inner wall of an air inlet chamber of the gas turbine, one end of the cross beam guide rail is connected with the fixing support, the other end of the cross beam guide rail is connected with a gas turbine shaft head sealing flange in the gas turbine, the travelling crane can slide on the cross beam guide rail, one end of the travelling crane is connected with the shaft head structure through the connecting plate, the other end of the travelling crane is connected with the counterweight support, and the counterweight support is provided with counterweight blocks. The present application realizes the dismounting and maintenance of the bearing within a short time, greatly shortens the maintenance time and cost, reduces the influence on production and effectively prolongs the stable operation time of the gas turbine.

Description

Technical Field

[0001] This invention belongs to the field of gas turbine technology, specifically relating to a disassembly and assembly device for gas turbine bearings. Background Technology

[0002] Bearings in heavy-duty gas turbines typically operate in high-temperature, high-pressure, and high-speed environments, making them extremely demanding components and prone to failure. If bearings experience fatigue spalling, slippage, or abrasive damage during operation, it can lead to decreased turbine performance, increased vibration, and even shutdown. This not only affects the overall service life of the gas turbine but also negatively impacts the safe and stable operation of the unit.

[0003] However, due to structural design limitations, bearings typically require maintenance only during turbine opening. This means that even if bearings are damaged during the gas turbine's operating cycle, they must be replaced during a major overhaul. Frequent overhauls significantly increase maintenance costs and reduce the gas turbine's economic efficiency. To address this issue, the structural design of heavy-duty gas turbines needs to be improved to provide solutions for easy bearing maintenance and the necessary disassembly and assembly tools. This would allow bearings to be inspected and replaced during routine maintenance, reducing reliance on major overhauls. Summary of the Invention

[0004] To address the aforementioned technical problems—namely, how to shorten bearing maintenance time and cost, reduce the impact on production, and effectively extend the stable operating time of the gas turbine—this invention provides the following technical solution:

[0005] A disassembly and assembly device for gas turbine bearings includes a shaft head structure and a disassembly and assembly tool used in conjunction with the shaft head structure. The shaft head structure includes a thrust disc and a main shaft detachably connected to the thrust disc. A thrust radial combined bearing is connected to the rear end of the thrust disc. The disassembly and assembly tool includes a fixed bracket, a crossbeam guide rail, a traveling trolley, a connecting plate, and a counterweight bracket. The fixed bracket is used to connect to the inner wall of the gas turbine's intake chamber. One end of the crossbeam guide rail is connected to the fixed bracket, and the other end of the crossbeam guide rail is connected to the gas turbine shaft head sealing flange in the gas turbine. The traveling trolley can slide on the crossbeam guide rail. One end of the traveling trolley is connected to the shaft head structure through the connecting plate, and the other end of the traveling trolley is connected to the counterweight bracket, which is equipped with a counterweight block.

[0006] Furthermore, the thrust disc is connected to the main shaft via shaft head tie rod bolts and shaft head tie rod nuts. The rear end of the thrust disc is connected to a thrust radial combined bearing, and the front end of the thrust disc is connected to a flange, which is connected to a coupling.

[0007] Furthermore, the fixed bracket includes a first front end plate, a crossbeam, and a first rear end plate. The crossbeam is disposed between the first front end plate and the first rear end plate. The first front end plate is connected to an outer bracket disposed on the inner wall of the gas turbine's intake chamber, and the first rear end plate is connected to an inner bracket disposed on the inner wall of the gas turbine's intake chamber.

[0008] Furthermore, the fixed bracket also includes an adjustment block, which has an adjustment through hole in the vertical direction and a tightening hole in the horizontal direction; a vertical bolt passes through the adjustment through hole, and the tightening hole, the waist hole provided on the first front end plate, and the waist hole provided on the outer bracket are connected in sequence by horizontal bolts.

[0009] Furthermore, the crossbeam guide rail consists of a second front end plate, a guide rail, and a second rear end plate. The guide rail is connected between the second front end plate and the second rear end plate. The second front end plate is connected to the first front end plate, and the second rear end plate is connected to the gas turbine shaft head sealing flange.

[0010] Furthermore, the trolley includes a trolley body, a first lower connecting plate connected to the front end of the trolley body, and a second lower connecting plate connected to the rear end of the trolley body; the trolley is slidably mounted on the guide rail via the trolley body.

[0011] Furthermore, the top of the connecting plate is connected to the second lower connecting plate; the connecting plate has several waist holes, and the right side of the connecting plate is connected to parts that need to be disassembled and assembled through the waist holes, including the thrust disc and the thrust radial combined bearing; the left side of the connecting plate is connected to the counterweight bracket.

[0012] Furthermore, the counterweight support includes a support end plate, a hanging rod, and a counterweight plate. The support end plate is connected to the left side of the connecting plate. The hanging rod includes an integrally connected vertical rod and a horizontal rod. The vertical rod is connected to the first lower connecting plate, and the horizontal rod is connected between the support end plate and the counterweight plate.

[0013] Furthermore, the counterweight bracket also includes a counterweight block, and the counterweight plate is provided with several counterweight terminals, through which the counterweight block is mounted on the counterweight plate.

[0014] Furthermore, the counterweight support also includes a pull ring, which is located at the connection node between the horizontal bar and the counterweight plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) Traditional bearing maintenance needs to be carried out during gas turbine overhaul, which involves a complex disassembly and assembly process. However, with the shaft head structure design and special disassembly and assembly tools of this invention, the disassembly and maintenance of the bearing can be completed in a short time, which greatly shortens the maintenance time and cost, reduces the impact on production, and effectively extends the stable operation time of the gas turbine.

[0017] (2) In the traditional gas turbine shaft head structure, the thrust disc is usually an integral structure with the main shaft and cannot be disassembled; however, the thrust disc in this invention is connected to the main shaft through the shaft head tie rod bolt, which makes the thrust disc easy to disassemble and assemble, thereby realizing the subsequent disassembly and maintenance of the thrust radial combined bearing and improving the maintainability of the gas turbine.

[0018] (3) Traditional disassembly and assembly tools are usually more complicated and not universal; however, the disassembly and assembly tools in this invention adopt a modular design. The fixed bracket and crossbeam guide rail can be adjusted during installation to adapt to different gas turbine models. The connecting plate has multiple waist holes, which can be connected to different shaft heads or bearings for disassembly and assembly. The counterweight can also be adjusted according to the weight of the connected parts, which improves the universality and flexibility of the disassembly and assembly tools. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the shaft head structure of the present invention;

[0020] Figure 2 This is an exploded view of the shaft head structure of the present invention, omitting shaft head tie rods, bolts, etc.

[0021] Figure 3 This is a schematic diagram of the disassembly and assembly tool structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the working structure of the disassembly and assembly tool of the present invention;

[0023] Figure 5 This is a schematic diagram of the disassembly and assembly tool of the present invention after installation and fixation;

[0024] Figure 6 This is a schematic diagram of the structure of the fixing bracket of the present invention;

[0025] Figure 7 This is a schematic diagram of the leveling structure of the adjustment block of the present invention;

[0026] Figure 8 This is a schematic diagram of the working structure of the beam guide rail of the present invention;

[0027] Figure 9 This is a schematic diagram of the working structure of the counterweight support of the present invention;

[0028] Figure 10 This is a schematic diagram of the disassembly and assembly tool of the present invention when it is not equipped with a counterweight.

[0029] Figure 11 This is a static simulation diagram of the disassembly and assembly tool of the present invention;

[0030] Figure 12 This is a dynamic simulation diagram of the disassembly and assembly tool of the present invention.

[0031] Figure label:

[0032] 1-Shaft head structure; 11-Thrust disc; 12-Main shaft; 13-Shaft head tie rod bolt; 14-Shaft head tie rod nut; 15-Thrust radial combined bearing; 16-Flange;

[0033] 2-Fixed bracket; 21-Adjusting block; 211-Adjusting through hole; 212-Tightening hole; 22-First front end plate; 23-Crossbeam; 24-First rear end plate;

[0034] 3-Crossbeam guide rail; 31-Second front end plate; 32-Guide rail; 33-Second rear end plate; 4-Crane; 41-Crane body; 42-First lower connecting plate; 43-Second lower connecting plate; 5-Connecting plate;

[0035] 6-Counterweight bracket; 61-Bracket end plate; 62-Hanging rod; 621-Vertical rod; 622-Horizontal rod; 63-Pull ring; 64-Counterweight block; 65-Counterweight plate; 651-Counterweight terminal;

[0036] 7-Intake chamber wall; 8-Outer support; 9-Inner support; 10-Gas turbine shaft head sealing flange. Detailed Implementation

[0037] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0038] It should be noted that the terms "center", "upper", "lower", "horizontal", "left", "right", "front", "rear", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0039] This invention provides a disassembly and assembly device for disassembling and assembling gas turbine bearings, including a shaft head structure 1 and a disassembly and assembly tool used in conjunction with the shaft head structure 1. The disassembly and assembly tool is used to disassemble and assemble parts that need to be disassembled and assembled, including bearings and shaft head structures in a gas turbine.

[0040] like Figure 1As shown, the shaft head structure 1 includes a thrust plate 11 and a main shaft 12. The thrust plate 11 is connected to the main shaft 12 via shaft head tie rod bolts 13 and shaft head tie rod nuts 14. A thrust radial combined bearing 15 is connected to the rear end of the thrust plate 11, and a flange 16 is provided at the front end of the thrust plate 11 to connect a coupling, thereby realizing the connection function of the shaft head structure 1. Figure 2 As shown, after removing the thrust disc 11, the rear thrust radial combined bearing 15 can be disassembled, installed, inspected, and maintained.

[0041] like Figure 3 As shown, the assembly / disassembly tools include a fixed bracket 2, a crossbeam guide rail 3, a traveling trolley 4, a connecting plate 5, and a counterweight bracket 6. Figure 4 As shown, one end of the crossbeam guide rail 3 is connected to the fixed bracket 2, and the other end is used to connect to the gas turbine shaft head sealing flange 10 in the gas turbine. A traveling trolley 4 is installed on the crossbeam guide rail 3, and one end of the traveling trolley 4 is connected to the connecting plate 5. The connecting plate 5 can be connected to the thrust plate 11 and the thrust radial combined bearing 15 by bolts.

[0042] like Figure 4 As shown, after the connecting plate 5 connects the parts, the trolley 4 moves on the crossbeam guide rail 3 to achieve horizontal movement of the parts; and the weight of the parts connected to the connecting plate 5 is balanced by the weight of the counterweight block 64 installed on the counterweight bracket 6, so that the trolley 4 can maintain stable movement.

[0043] like Figure 5 As shown, the mounting bracket 2 is used to secure the entire disassembly and assembly tool to the inner wall 7 of the gas turbine's intake chamber. (As shown...) Figure 6 As shown, the fixed bracket 2 consists of an adjustment block 21, a first front end plate 22, a crossbeam 23, and a first rear end plate 24. The front side of the crossbeam 23 is connected to the first front end plate 22, and the rear side of the crossbeam 23 is connected to the first rear end plate 24.

[0044] Specifically, such as Figure 5 As shown, a protruding plate is provided on the inner wall 7 of the gas turbine intake chamber. The protruding plate includes an outer bracket 8 and an inner bracket 9 fixed to the inner wall 7 of the intake chamber. Both the outer bracket 8 and the inner bracket 9 are provided with several waist holes. Waist holes are also provided on the first front end plate 22. The outer bracket 8 and the first front end plate 22 are connected by transverse bolts passing through the waist holes of both, thereby connecting the first front end plate 22 to the inner wall 7 of the intake chamber.

[0045] like Figure 5 As shown, the adjustment block 21 is set on the outer side of the first front end plate 22. The adjustment block 21 is used to level the entire disassembly and assembly tool. The adjustment block 21, the first front end plate 22 and the outer bracket 8 are connected in the horizontal direction by bolts.

[0046] Specifically, in combination Figure 5 , Figure 6As shown, the adjustment block 21 has an adjustment through hole 211 in the vertical direction and a tightening hole 212 in the horizontal direction. After the vertical bolt is inserted into the adjustment through hole 211, the horizontal bolt is then inserted into the tightening hole 212, the waist hole of the first front end plate 22 and the waist hole of the outer bracket 8 in sequence, and then fixed by tightening the nut of the vertical bolt.

[0047] By connecting the adjusting block 21 to the first front end plate 22, the adjusting block 21 is fixedly connected to the protruding plate of the intake chamber wall 7. Figure 7 As shown, by turning the nut on the vertical bolt, the fixed bracket 2 can be leveled in both the horizontal and vertical directions.

[0048] Combination Figure 6 , Figure 7 As shown, several threaded holes are provided below the first front end plate 22 for threaded connection with the crossbeam guide rail 3.

[0049] like Figure 8 As shown, the crossbeam guide rail 3 consists of a second front end plate 31, a guide rail 32, and a second rear end plate 33. The guide rail 32 connects the second front end plate 31 and the second rear end plate 33, as shown. Figure 5 As shown, the second front end plate 31 is bolted to the first front end plate 22, and the second rear end plate 33 is connected to the gas turbine shaft head sealing flange 10.

[0050] like Figure 8 As shown, the traveling tractor 4 includes a traveling tractor body 41, a first lower connecting plate 42 connected to the front end of the traveling tractor body 41, and a second lower connecting plate 43 connected to the rear end of the traveling tractor body 41. The traveling tractor 4 is mounted on a guide rail 32 via the traveling tractor body 41. Rollers are provided inside the traveling tractor body 41, allowing the traveling tractor 4 to move horizontally along the guide rail 32.

[0051] like Figure 8 As shown, the second lower connecting plate 43 is threadedly connected to the left side of the connecting plate 5. The connecting plate 5 has several slotted holes, and the right side of the connecting plate 5 is connected to parts that need to be disassembled or assembled, such as the thrust disc 11 and the thrust radial combined bearing 15, through the slotted holes on the connecting plate 5.

[0052] like Figure 9 As shown, the counterweight support 6 consists of a support end plate 61, a hanging rod 62, a pull ring 63, a counterweight plate 65, and a counterweight block 64; the support end plate 61 is connected to the left side of the connecting plate 5 by bolts; the hanging rod 62 adopts the lever principle, and the hanging rod 62 includes an integrally connected vertical rod 621 and a horizontal rod 622. The horizontal rod 622 is connected between the support end plate 61 and the counterweight plate 65, and the top of the vertical rod 621 is connected to the first lower connecting plate 42.

[0053] like Figure 9As shown, the pull ring 63 is located outside the connection node between the transverse rod 622 and the counterweight plate 65, and the counterweight bracket 6 is moved by pulling the pull ring 63. The counterweight block 64 is provided with several counterweight terminals 651, and the counterweight block 64 is installed on the counterweight plate 65 through the counterweight terminals 651.

[0054] Each counterweight 64 weighs 20kg, and the number of counterweights 64 installed can be adjusted according to the weight of the parts. The counterweights 64 use the torque balance principle through the lifting rod 62 to balance the weight of the parts to be disassembled and assembled, so that the crane 4 can maintain a stable center of gravity when moving with the parts and avoid jamming.

[0055] Work process:

[0056] Preparatory work: Before proceeding with disassembly and assembly, adjust the jacking bolts at the bottom of the gas turbine to lift the rotor, facilitating the removal or installation of components in contact with the rotor. Then, use a hydraulic wrench or similar tools to remove the shaft head tie rod nut 14, after which the formal steps can proceed.

[0057] 1. Install the fixing bracket 2. First, connect and fix the first rear end plate 24 to the inner bracket 9 of the intake chamber wall 7. Then, align the waist hole on the first front end plate 22 with the waist hole on the outer bracket 8 of the intake chamber wall 7. Next, pass the bolt above the adjusting block 21 through the adjusting through hole 211 on the first front end plate 22, and pass one side of the adjusting block 21 through the waist hole. After passing through, fix it with a nut. At this time, the adjusting block 21 is fixedly connected to the protruding plate of the intake chamber wall 7 and connected to the first front end plate 22 of the fixing bracket 2 by bolts.

[0058] 2. Insert the traveling trolley 4 into the second rear end plate 33 side of the crossbeam guide rail 3, then reinstall the second rear end plate 33. Next, connect and fix the second rear end plate 33 to the gas turbine shaft head sealing flange 10. Then, connect and fix the second front end plate 31 to the fixed bracket 2. Apply lubricating oil to the guide rail 32 and check whether the traveling trolley 4 can slide smoothly along the crossbeam guide rail 3. After fixing, the disassembly and assembly tools are as follows: Figure 5 As shown.

[0059] 3. Place a spirit level and adjust the disassembly and assembly tools horizontally and vertically by turning the nut on top of adjusting block 21. Figure 7 As shown. After leveling, connect and fix the connecting plate 5 to the crane 4. Then install and fix the counterweight bracket 6 onto the connecting plate 5. Install the lifting rod 62 and tighten the nuts at both ends of the lifting rod 62. Move the crane 4 so that the connecting plate 5 is in contact with the thrust plate 11. Pass the bolts through the connecting plate 5 and connect and fix it to the thrust plate 11, as shown. Figure 10 As shown.

[0060] 4. Install counterweight 64 onto counterweight bracket 6. A total of 6 counterweights are installed when disassembling thrust plate 11. Figure 4As shown. At this time, the point where the boom 62 connects to the counterweight bracket 6 serves as the fulcrum. The weight of the counterweight block 64 can balance the weight of the parts that need to be disassembled, so that the crane 4 can maintain a stable center of gravity when moving with the parts, making it easier to remove the thrust plate 11. The force analysis is as follows. Figure 11 , 12 As shown. Then, pull the pull ring 63 on the counterweight bracket 6 to move the crane 4 along the axial direction with the thrust plate 11, so that the thrust plate 11 can be removed from the outside.

[0061] 5. Remove the counterweight 64, push the trolley 4 back so that the connecting plate 5 fits against the thrust radial bearing 15, and pass the bolts through the connecting plate 5 to connect and fix it to the thrust radial bearing 15. Then install 6 counterweights onto the counterweight bracket 6, pull the pull ring 63 on the counterweight bracket 6 to move the trolley 4 with the thrust radial bearing 15 axially out, and then remove the thrust radial bearing 15 from the outside.

[0062] 6. After inspecting and maintaining the thrust radial combined bearing 15, the thrust radial combined bearing 15 and the thrust disc 11 can be reinstalled back to their original positions in sequence according to the above procedure. The overall disassembly and assembly operation can be completed without opening the cylinder.

[0063] The above technical features constitute the preferred embodiment of the present invention, which has strong adaptability and optimal implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

[0064] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, such as changing the connection method between the disassembly and assembly tool and the shaft head or increasing or decreasing the number of counterweights, are all obvious substitutions that fall within the scope of protection of the present invention.

Claims

1. A disassembly and assembly device for gas turbine bearings, characterized in that, The assembly includes a shaft head structure and assembly / disassembly tools used in conjunction with the shaft head structure. The shaft head structure includes a thrust disc and a main shaft that is detachably connected to the thrust disc. A thrust radial combined bearing is connected to the rear end of the thrust disc. The assembly / disassembly tools include a fixed bracket, a crossbeam guide rail, a traveling trolley, a connecting plate, and a counterweight bracket. The fixed bracket is used to connect to the inner wall of the gas turbine's intake chamber. One end of the crossbeam guide rail is connected to the fixed bracket, and the other end of the crossbeam guide rail is connected to the gas turbine shaft head sealing flange in the gas turbine. The traveling trolley can slide on the crossbeam guide rail. One end of the traveling trolley is connected to the shaft head structure through the connecting plate, and the other end of the traveling trolley is connected to the counterweight bracket, which is equipped with a counterweight block.

2. The disassembly and assembly equipment for gas turbine bearings according to claim 1, characterized in that, In the shaft head structure, the thrust disc is connected to the main shaft via shaft head tie rod bolts and shaft head tie rod nuts. The rear end of the thrust disc is connected to a thrust radial combined bearing, and the front end of the thrust disc is connected to a flange, which is connected to a coupling.

3. The disassembly and assembly equipment for gas turbine bearings according to claim 2, characterized in that, The fixed support includes a first front end plate, a crossbeam, and a first rear end plate. The crossbeam is disposed between the first front end plate and the first rear end plate. The first front end plate is connected to an outer support disposed on the inner wall of the gas turbine's intake chamber, and the first rear end plate is connected to an inner support disposed on the inner wall of the gas turbine's intake chamber.

4. The disassembly and assembly equipment for gas turbine bearings according to claim 3, characterized in that, The fixed bracket also includes an adjustment block, which has an adjustment through hole in the vertical direction and a tightening hole in the horizontal direction. A vertical bolt passes through the adjustment through hole, and the tightening hole, the waist hole on the first front end plate, and the waist hole on the outer bracket are connected in sequence by horizontal bolts.

5. The disassembly and assembly equipment for gas turbine bearings according to claim 3, characterized in that, The crossbeam guide rail consists of a second front end plate, a guide rail, and a second rear end plate. The guide rail is connected between the second front end plate and the second rear end plate. The second front end plate is connected to the first front end plate, and the second rear end plate is connected to the gas turbine shaft head sealing flange.

6. The disassembly and assembly equipment for gas turbine bearings according to claim 5, characterized in that, The traveling crane includes a traveling crane body, a first lower connecting plate connected to the front end of the traveling crane body, and a second lower connecting plate connected to the rear end of the traveling crane body; the traveling crane is slidably mounted on the guide rail via the traveling crane body.

7. The disassembly and assembly equipment for disassembling and assembling gas turbine bearings according to claim 6, characterized in that, The top of the connecting plate is connected to the second lower connecting plate; several waist holes are opened on the connecting plate, and the right side of the connecting plate is connected to parts that need to be disassembled and assembled through the waist holes; the left side of the connecting plate is connected to the counterweight bracket.

8. The disassembly and assembly equipment for gas turbine bearings according to claim 6 or 7, characterized in that, The counterweight support includes a support end plate, a hanging rod, and a counterweight plate. The support end plate is connected to the left side of the connecting plate. The hanging rod includes an integrally connected vertical rod and a horizontal rod. The vertical rod is connected to the first lower connecting plate, and the horizontal rod is connected between the support end plate and the counterweight plate.

9. The disassembly and assembly equipment for disassembling and assembling gas turbine bearings according to claim 8, characterized in that, The counterweight bracket also includes counterweight blocks, and several counterweight terminals are provided on the counterweight plate. The counterweight blocks are set on the counterweight plate through the counterweight terminals.

10. The disassembly and assembly equipment for gas turbine bearings according to claim 8, characterized in that, The counterweight support also includes a pull ring, which is located at the connection node between the horizontal bar and the counterweight plate.

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