Disassembling tool special for tail blade of steam turbine rotor

Abstract

The utility model relates to a special dismounting tool for a tail blade of a steam turbine rotor, which belongs to the technical field of steam turbines and comprises a U-shaped support, an opening of the support faces downwards, an adjusting screw penetrates through the top end of the support, a hexagon nut is sleeved on the adjusting screw, guide grooves are arranged on the inner walls of two sides of the support, and a guide block capable of moving up and down is mounted between the two guide grooves. The guide block is fixedly connected with the lower end of the adjusting screw rod, a stepped center shaft is installed on the guide block, the center shaft penetrates through the guide block, a back arc hook and an inner arc hook are arranged on the center shaft in a sleeved mode, and a forward thread section and a reverse thread section are arranged on the center shaft. The tool is wider in application range, the back arc hook and the inner arc hook move oppositely by rotating the center shaft, so that the tail blade is clamped, operation is easy, convenient and efficient, the guide block moves along the guide groove of the support, the structure is stable, the tool is not prone to deformation, the tail blade is large in stress area and even in stress, the blade is not prone to damage, and the space needed by tool operation is small.

Description

Technical Field

[0001] The utility model relates to a special disassembly tool for the last blade of a steam turbine rotor, belonging to the technical field of steam turbines. Background Art

[0002] When installing the turbine rotor impeller blades, sometimes the tight gaskets under the adjacent blades shift and occupy the installation space under the last blade, making it impossible to install the last blade in place. The last blade must be pulled out, adjusted and reinstalled. Sometimes, after the blades are installed, it is necessary to turn a dovetail groove on the impeller crown, and then pull out the last blade to install the dovetail shroud. In both cases, the last blade needs to be pulled out without damage.

[0003] In the prior art, there are the following methods for pulling out the last blade:

[0004] (1) Hammering method: Remove the last blade from the two adjacent blades by hammering.

[0005] (2) Welding method: Weld the screw rod to the crown of the last blade and pull it out by cold drawing using a pin puller.

[0006] (3) Processing method: Use a milling machine to mill off the last blade.

[0007] (4) Tooling method: Use existing tooling tools to pull out the last blade with a dovetail groove on the crown.

[0008] The above method has the following disadvantages:

[0009] (1) Hammering method: The distance between adjacent impellers is too small to be used with a hand hammer. In addition, there is a certain amount of tension between the blades, so it is very difficult to pull them out with a hammer, and it is easy to damage other parts of the impeller.

[0010] (2) Welding method: Welding a screw rod at the crown of the last blade and pulling it out with a pin puller can easily cause the last blade to deform and become scrapped.

[0011] (3) Processing method: This causes the last blade to be scrapped, increases the rotor processing time, and easily damages other parts of the impeller.

[0012] (4) Fixture method: It is only applicable to the last blade with a dovetail groove on the crown. It has a narrow application range. In addition, the existing fixture structure is unstable, the force-bearing area is small, and the force is uneven, which can easily cause deformation of the fixture and damage to the blade.

[0013] The utility model patent with application number CN202210821078.4 discloses a tool for extracting the last blades of a turbine rotor impeller. The arc structures of the back arc hook and the inner arc hook are relatively arranged, and two nuts are located at the outer ends of the back arc hook and the inner arc hook. The positions of the back arc hook and the inner arc hook are adjusted by rotating the two nuts. The operation is cumbersome and inefficient. Utility Model Content

[0014] The utility model aims to solve the technical problems in the prior art that it is difficult to pull out the last blade, the last blade is easily damaged, and the operation is cumbersome, and provides a special disassembly tool for the last blade of a steam turbine rotor.

[0015] The utility model is realized by the following technical solutions:

[0016] That is, a special disassembly tool for the last blade of a steam turbine rotor, comprising a U-shaped bracket, the bracket opening faces downward, an adjusting screw is passed through the top of the bracket, a hexagonal nut is sleeved on the adjusting screw, guide grooves are opened on the inner walls on both sides of the bracket, a guide block that can move up and down is installed between the two guide grooves, the guide block is fixedly connected to the lower end of the adjusting screw, a stepped central axis is installed on the guide block, the central axis passes through the guide block, a back arc hook and an inner arc hook are sleeved on the central axis, a guide rod is respectively passed through the upper part of the back arc hook and the inner arc hook, the inner end of the guide rod is fixedly connected to the guide block, and a forward thread section and a reverse thread section are provided on the central axis.

[0017] The back arc hook and the inner arc hook can be designed and replaced according to different blade structures. There is no need for the last blade crown to have a dovetail groove, and the application range is wider. The back arc hook and the inner arc hook can be moved toward each other by rotating the central axis, so as to clamp the last blade. The operation is simple and efficient. The guide block moves along the guide groove of the bracket. The structure is stable, the tooling is not easy to deform, the force-bearing area of ​​the last blade is large, the force is evenly distributed, the blade is not easily damaged, the space required for tooling operation is small, and other parts of the impeller will not be affected.

[0018] Further preferably, a labor-saving rod is installed on one end of the central shaft, and the labor-saving rod radially penetrates the central shaft. The labor-saving rod is installed on the central shaft, and the central shaft is rotated by holding the labor-saving rod to save time and effort.

[0019] Preferably, the guide rod extends outward beyond the outer edges of the forward thread segment and the reverse thread segment. When replacing the back arc hook and the inner arc hook, first put the back arc hook and the inner arc hook on the central shaft, insert the inner ends of the back arc hook and the inner arc hook into the thread segment, and rotate the central shaft to adjust the back arc hook and the inner arc hook into place.

[0020] Further preferably, a limiting boss is provided on the central shaft, and the limiting boss is located between the guide block and the back arc hook, so as to play a role in rapid and accurate positioning when installing the central shaft.

[0021] More preferably, the lower end surfaces of the back arc hook and the inner arc hook are flush.

[0022] Further preferably, the lower end surface of the hexagonal nut is in close contact with the upper end surface of the bracket.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The back arc hook and the inner arc hook can be designed and replaced according to different blade structures. There is no need for the last blade crown to have a dovetail groove, and the application range is wider. The back arc hook and the inner arc hook can be moved toward each other by rotating the central axis, so as to clamp the last blade. The operation is simple and efficient. The guide block moves along the guide groove of the bracket. The structure is stable, the tooling is not easy to deform, the force-bearing area of ​​the last blade is large, the force is evenly distributed, the blade is not easily damaged, the space required for tooling operation is small, and other parts of the impeller will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a specific implementation method of the utility model.

[0027] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure.

[0028] In the figure: 1. Hexagonal nut; 2. Adjusting screw; 3. Bracket; 4. Labor-saving rod; 5. Back arc hook; 6. Inner arc hook; 7. Center axis; 8. Forward thread section; 9. Reverse thread section; 10. Guide rod; 11. Guide block. DETAILED DESCRIPTION

[0029] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 , 2 The shown tool is a special disassembly tool for the last blade of a steam turbine rotor, comprising a U-shaped bracket 3, the bracket 3 opening facing downward, an adjusting screw 2 passed through the top of the bracket 3, a hexagonal nut 1 sleeved on the adjusting screw 2, the lower end surface of the hexagonal nut 1 is in close contact with the upper end surface of the bracket 3, guide grooves are provided on the inner walls on both sides of the bracket 3, a guide block 11 which can move up and down is installed between the two guide grooves, the guide block 11 is fixedly connected to the lower end of the adjusting screw 2, a stepped central axis 7 is installed on the guide block 11, the central axis 7 passes through the guide block 11, a back arc hook 5 and an inner arc hook 6 are sleeved on the central axis 7, a guide rod 10 is respectively passed through the upper part of the back arc hook 5 and the inner arc hook 6, the inner end of the guide rod 10 is fixedly connected to the guide block 11, a forward thread section 8 and a reverse thread section 9 are provided on the central axis 7, and the lower end surfaces of the back arc hook 5 and the inner arc hook 6 are flush.

[0031] The inner arc hook 6 and the back arc hook 5 can be designed and replaced according to different blade structures. There is no need for the last blade crown to have a dovetail groove, and the application range is wider. The guide block 11 moves along the guide groove of the bracket, the structure is stable, the tooling is not easy to deform, the last blade has a large force-bearing area, the force is evenly distributed, the blade is not easy to be damaged, the space required for tooling operation is small, and it will not affect other parts of the impeller.

[0032] Among them, a labor-saving rod 4 is installed on one end of the central shaft 7, and the labor-saving rod 4 radially penetrates the central shaft 7. The labor-saving rod 4 is installed on the central shaft 7, and the labor-saving rod 4 is held by hand to rotate the central shaft 7 to save time and effort.

[0033] The guide rod 10 extends outward beyond the outer edges of the forward thread segment 8 and the reverse thread segment 9. When replacing the back arc hook 5 and the inner arc hook 6, first put the back arc hook 5 and the inner arc hook 6 on the central shaft 7, insert the inner ends of the back arc hook 5 and the inner arc hook 6 into the thread segment, and rotate the central shaft 7 to adjust the back arc hook 5 and the inner arc hook 6 into place.

[0034] A limiting boss is provided on the central shaft 7, and the limiting boss is located between the guide block 11 and the back arc hook, so as to play a role of fast and accurate positioning when installing the central shaft.

[0035] Working principle:

[0036] The inner arc hook 6 and the back arc hook 5 can be designed and replaced according to different blade structures. The last blade crown does not need to have a dovetail groove, and the application range is wider. The guide block 11 moves along the guide groove of the bracket, the structure is stable, the tooling is not easy to deform, the last blade has a large force area, the force is even, the blade is not easy to be damaged, the tooling operation requires a small space, and will not affect other parts of the impeller. The inner arc hook 6 and the back arc hook 5 clamp the last blade, and the hexagonal nut 1 is rotated by using a tool to realize the lifting and lowering of the adjusting screw 2, thereby pulling out the last blade.

[0037] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0038] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A special removal tool for the last blade of a steam turbine rotor, characterized in that: The invention comprises a U-shaped bracket (3), the bracket (3) opening is downward, an adjusting screw (2) is passed through the top of the bracket (3), a hexagonal nut (1) is sleeved on the adjusting screw (2), guide grooves are opened on the inner walls of both sides of the bracket (3), a guide block (11) movable up and down is installed between the two guide grooves, the guide block (11) is fixedly connected to the lower end of the adjusting screw (2), a stepped central axis (7) is installed on the guide block (11), the central axis (7) passes through the guide block (11), a back arc hook (5) and an inner arc hook (6) are sleeved on the central axis (7), a guide rod (10) is respectively passed through the upper part of the back arc hook (5) and the inner arc hook (6), the inner end of the guide rod (10) is fixedly connected to the guide block (11), and a forward thread section (8) and a reverse thread section (9) are provided on the central axis (7).

2. A special removal tool for the last blade of a steam turbine rotor according to claim 1, characterized in that: A labor-saving rod (4) is mounted on one end of the central shaft (7), and the labor-saving rod (4) radially penetrates the central shaft (7).

3. A special removal tool for the last blade of a steam turbine rotor according to claim 1, characterized in that: The guide rod (10) extends outward to a position beyond the outer edges of the forward thread segment (8) and the reverse thread segment (9).

4. A special removal tool for the last blade of a steam turbine rotor according to claim 1, characterized in that: A limiting boss is provided on the central shaft (7), and the limiting boss is located between the guide block (11) and the back arc hook (5).

5. A special removal tool for the last blade of a steam turbine rotor according to claim 1, characterized in that: The lower end surfaces of the back arc hook (5) and the inner arc hook (6) are flush.

6. A special removal tool for the last blade of a steam turbine rotor according to claim 1, characterized in that: The lower end surface of the hexagonal nut (1) is in close contact with the upper end surface of the bracket (3).

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