Tool for pulling out locking mouth moving blades of steam turbine rotor

Abstract

The utility model discloses a tool for pulling a locking opening moving blade of a steam turbine rotor, and belongs to the technical field of steam turbines. In order to solve the problem that the fore shaft blade is very difficult to pull due to the existence of interference and narrow space at the fore shaft blade. The tool comprises a pull claw and a double-end stud, one end of the pull claw is provided with a locking opening used for fixing a blade crown, and the blade crown of the blade is inserted into the pull claw through the locking opening; a threaded hole is formed in the other end of the pull claw, the double-end stud is in threaded connection with the pull claw through the threaded hole, and one end of the double-end stud extends towards the blade side and abuts against the blade crown of the blade to the inner end face of the pull claw, so that the blade is fixed; and the other end of the double-end stud is connected with a sliding weight so as to pull out the blade. The pulling device is mainly used for pulling the locking moving blade.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbines, and relates to a tooling for extracting the locking moving blades of a steam turbine rotor. Background Technique

[0002] The steam turbine rotor is the most important and precise core component of the steam turbine. During the process of converting the kinetic energy of steam into mechanical energy, the torque generated by the circumferential component of steam and the mechanical work output outward mainly act on the moving blades. There are a large number of moving blades and a large amount of processing, and strict requirements are imposed on the processing and assembly of the blades.

[0003] Since the rotor speed is as high as 3000r / min - 8000r / min, during assembly, in addition to ensuring that each stage of blades are assembled into a circle, an interference amount of more than 0.2mm - 0.4mm needs to be additionally increased. In order to ensure that the blades fit tightly without gaps, the locking blades need to be tightened multiple times to a certain position, precisely measure the interference amount and then pulled out until the final interference size is ensured. During this process, due to the existence of the interference amount and the narrow space at the locking blade position, it is very difficult to extract the locking blades. Conventionally, a copper bar is used to knock out the locking blades, but it is easy to cause damage to the steam outlet side of the blades. Even more, due to the large interference amount and the small stress surface, it is impossible to extract the blades. Finally, the tooling is spot-welded to the blade end, and then the pull pin is used to extract the blade, resulting in additional spot-welding marks on the finish-machined surface of the blade end, affecting the surface quality. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a tooling for extracting the locking moving blades of a steam turbine rotor, and uses the tooling and a slide hammer to pull out the blades.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] A tooling for extracting the locking moving blades of a steam turbine rotor includes a first claw and a stud. One end of the first claw is provided with a lock for fixing the blade crown, and the blade crown is inserted into the first claw through the lock. The other end of the first claw is provided with a threaded hole, and the stud is screwed to the first claw through the threaded hole. One end of the stud extends towards the blade side and presses the blade crown against the inner end face of the first claw to fix the blade. The other end of the stud is connected to a slide hammer to pull out the blade.

[0007] Preferably, the first pulling claw includes a left pulling claw, a right pulling claw, a connecting bolt and a pulling claw cross beam rod; the left pulling claw and the right pulling claw have the same structure and are symmetrically arranged, the connecting bolt connects the left pulling claw and the right pulling claw, and one end of the left pulling claw and the right pulling claw forms a locking mouth and locks the blade crown of the blade between the left pulling claw and the right pulling claw; the pulling claw cross beam rod penetrates through the left pulling claw and the right pulling claw and is far away from one end of the locking mouth, and a threaded hole is opened on the pulling claw cross beam rod, and a double-headed stud is screwed to the pulling claw cross beam rod to realize the connection between the double-headed stud and the first pulling claw.

[0008] Preferably, the left pulling claw and the right pulling claw are of an L-shaped structure, and the bent ends of the left pulling claw and the right pulling claw face inwards and form a locking mouth.

[0009] Preferably, the connecting bolt eccentrically connects the left pulling claw and the right pulling claw.

[0010] Preferably, rectangular holes are opened on both the left pulling claw and the right pulling claw, and the two rectangular holes are arranged oppositely. The cross section of the pulling claw cross beam rod is rectangular, and the pulling claw cross beam rod penetrates through the left pulling claw and the right pulling claw through the rectangular holes on the left pulling claw and the right pulling claw.

[0011] A tooling for extracting the locking moving blade of a steam turbine rotor includes a second pulling claw and a pull pin. One end of the second pulling claw is provided with a locking mouth, the pull pin penetrates through the tail end of the blade and is installed at the locking mouth of the second pulling claw, and the other end of the second pulling claw is provided with a threaded hole to connect a slide hammer to pull out the blade.

[0012] Preferably, the second pulling claw is of a U-shaped structure, the opening end of the second pulling claw bends upwards and forms a hook-shaped locking mouth, and a threaded hole is opened at the sealing end of the second pulling claw to connect a slide hammer.

[0013] The beneficial effects produced by the present utility model compared with the prior art are as follows:

[0014] The two toolings for extracting the locking moving blade of the present utility model have simple structures, are easy to assemble and operate; for the tooling for extracting the blade with a blade crown, a puller structure is adopted, which effectively fixes the blade crown and increases the force-bearing area at the blade top, easily extracts the locking blade that cannot be extracted due to a large interference fit and a narrow space, and will not cause damage to the blade, effectively protecting the surface quality of the blade. And the method is simple, fast, convenient, safe to use, greatly improves the assembly efficiency, shortens the production cycle by about 10 days, reduces the probability of blade damage when the blade is taken out, is safe, reliable, and easy to carry. For the blade without a crown, the pulling rib hole at the tail end of the blade is used as the force-bearing point to realize the extraction of the blade. Description of the Drawings

[0015] The drawings, as a part of this application, are used to provide a further understanding of the present utility model.

[0016] Figure 1It is a schematic structural diagram of the tooling for extracting the locking moving blades of the steam turbine rotor in Embodiment 1.

[0017] Figure 2 It is the front view of the left pull claw.

[0018] Figure 3 It is the top view of the left pull claw.

[0019] Figure 4 It is a schematic structural diagram of the tooling for extracting the locking moving blades of the steam turbine rotor in Embodiment 2.

[0020] Figure 5 It is the side view of the tooling in Embodiment 2.

[0021] Figure 6 It is the top view of the second pull claw.

[0022] Figure 7 It is the side view of the second pull claw.

[0023] Explanation of reference numerals: 1 - the first pull claw; 1 - 1 - the left pull claw; 1 - 2 - the right pull claw; 1 - 3 - the connecting bolt; 1 - 4 - the pull claw cross beam rod; 1 - 5 - the rectangular hole; 2 - the stud; 3 - the second pull claw; 3 - 1 - the locking port; 4 - the tension pin. Detailed implementation mode

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but do not limit the scope of the present utility model.

[0025] Since the moving blades of the steam turbine rotor are divided into blades with crowns and blades without crowns, this embodiment will be described separately for the two types of blades.

[0026] Embodiment 1:

[0027] See Figure 1 , this application embodiment provides a tooling for extracting the locking moving blades of the steam turbine rotor, including the first pull claw 1 and the stud 2; the first pull claw 1 includes the left pull claw 1 - 1, the right pull claw 1 - 2, the connecting bolt 1 - 3 and the pull claw cross beam rod 1 - 4; both the left pull claw 1 - 1 and the right pull claw 1 - 2 are L-shaped structures and are symmetrically arranged. The connecting bolt 1 - 3 connects the left pull claw 1 - 1 and the right pull claw 1 - 2 and is eccentrically arranged, which not only realizes their fixation but also does not affect the installation of the stud 2; the bent ends of the left pull claw 1 - 1 and the right pull claw 1 - 2 face inward and form a locking port for fixing the blade crown, and the blade crown is locked between the left pull claw 1 - 1 and the right pull claw 1 - 2;

[0028] A rectangular hole 1-5 is provided on the left claw 1-1 and the right claw 1-2 at one end away from the lock mouth, and the two rectangular holes 1-5 are arranged opposite to each other. The cross-section of the claw beam 1-4 is rectangular, and the claw beam 1-4 passes through the left claw 1-1 and the right claw 1-2 via the rectangular holes 1-5 on the left claw 1-1 and the right claw 1-2; a threaded hole is provided on the claw beam 1-4, and the stud 2 is screwed to the claw beam 1-4 via the threaded hole to achieve the connection between the stud 2 and the claw; one end of the stud 2 extends toward the blade side and presses the crown of the blade against the inner end face of the claw to achieve the fixation of the blade; the other end of the stud 2 is connected to a sliding hammer to pull out the blade.

[0029] This embodiment is aimed at a flat locking blade, that is, a blade with a crown. This type of blade has a force-bearing surface, so a puller-type structure tool can be used to extract the blade. The crown of this type of blade is square. By measuring the crown profile and matching the profile of the force-bearing surface of the pull claw, the pull claw and the force-bearing area at the bottom of the crown are maximized. Then the two pull claws are installed in the pull claw crossbar 1-4, and the two pull claws are fixed to the left and right of the crown with connecting bolts 1-3. Then the top of the crown is tightened with a double-headed stud 2 (top screw) to achieve a close fit between the tool and the blade. The forces acting on the crown will not offset each other due to the gap. At this time, the pin puller is connected to the top screw, and the blade can be easily pulled out with a 1Kg sliding hammer to exert force upward, which will not only prevent the blade from being damaged but also save time.

[0030] Embodiment 2:

[0031] The present embodiment provides a tool for extracting the locked moving blades of a turbine rotor, which is characterized by comprising a second pulling claw 3 and a pulling pin 4, wherein a locking opening 3-1 is provided at one end of the second pulling claw 3, the pulling pin 4 passes through the tail end of the blade and is installed at the locking opening of the second pulling claw 3, and a threaded hole is provided at the other end of the second pulling claw 3 to connect a sliding hammer to pull out the blade.

[0032] The second pulling claw 3 is a U-shaped structure, the opening end of the second pulling claw 3 is bent upward to form a hook-shaped locking opening, and the sealing end of the second pulling claw 3 is provided with a threaded hole to connect the slide hammer.

[0033] This embodiment is aimed at blades without a crown type locking mouth, that is, blades without a crown. This type of blade is more difficult to remove because it does not have a crown as a fulcrum. The extraction tool of this embodiment adopts a U-shaped structure, using the tie rod hole at the tail end of the blade as the force point, and a large semicircular barbed hook-shaped hole is opened at the head of the pull claw as a hook-shaped locking mouth. A tension pin of matching size is inserted into the tie rod hole, and threaded mounting nuts are machined at both ends of the tension pin to achieve the fixation of the tension pin and the blade. The tension pin is fixed with the hook-shaped locking mouth of the pull claw, and then the bolt hole at the tail end of the pull claw is used in conjunction with the pin puller to pull out the blade.

[0034] Although the present utility model has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present utility model. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, as long as they do not depart from the spirit and scope of the present utility model as defined by the appended claims. It should be understood that the different dependent claims and the features described herein can be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a single embodiment can be used in other described embodiments.

Claims

1. A tooling for extracting the locking blades of a steam turbine rotor, characterized in that: It includes a first pull claw (1) and a stud (2). One end of the first pull claw (1) is provided with a locking opening for fixing the blade shroud. The blade shroud is inserted into the first pull claw (1) through the locking opening. The other end of the first pull claw (1) is provided with a threaded hole, and the stud (2) is screwed to the first pull claw (1) through the threaded hole. One end of the stud (2) extends towards the blade side and presses the blade shroud against the inner end face of the first pull claw (1) to fix the blade. The other end of the stud (2) is connected to a slide hammer to pull out the blade.

2. A tool for extracting the locking blades of a steam turbine rotor according to claim 1, characterized in that: The first pull claw (1) includes a left pull claw (1-1), a right pull claw (1-2), a connecting bolt (1-3) and a pull claw cross beam rod (1-4). The left pull claw (1-1) and the right pull claw (1-2) have the same structure and are symmetrically arranged. The connecting bolt (1-3) connects the left pull claw (1-1) and the right pull claw (1-2). One end of the left pull claw (1-1) and the right pull claw (1-2) forms a locking opening and locks the blade shroud between the left pull claw (1-1) and the right pull claw (1-2). The pull claw cross beam rod (1-4) penetrates through the left pull claw (1-1) and the right pull claw (1-2) at the end far from the locking opening. A threaded hole is provided on the pull claw cross beam rod (1-4), and the stud (2) is screwed to the pull claw cross beam rod (1-4) to realize the connection between the stud (2) and the first pull claw (1).

3. The tooling for extracting the locking blades of a steam turbine rotor according to claim 2, wherein: The left pull claw (1-1) and the right pull claw (1-2) are of L-shaped structure, and the bent ends of the left pull claw (1-1) and the right pull claw (1-2) face inwards and form a locking opening.

4. A tooling for extracting the locking blades of a steam turbine rotor according to claim 2, characterized in that: The connecting bolt (1-3) is eccentrically connected to the left pull claw (1-1) and the right pull claw (1-2).

5. The tooling for extracting the locking moving blades of a steam turbine rotor according to claim 4, wherein: Rectangular holes (1-5) are provided on both the left pull claw (1-1) and the right pull claw (1-2), and the two rectangular holes (1-5) are arranged oppositely. The cross section of the pull claw cross beam rod (1-4) is rectangular, and the pull claw cross beam rod (1-4) penetrates through the left pull claw (1-1) and the right pull claw (1-2) through the rectangular holes (1-5) on the left pull claw (1-1) and the right pull claw (1-2).

6. A tooling for extracting the locking moving blades of a steam turbine rotor, characterized in that: It includes a second pull claw (3) and a pull pin (4). One end of the second pull claw (3) is provided with a locking opening. The pull pin (4) penetrates through the tail end of the blade and is installed at the locking opening of the second pull claw (3). The other end of the second pull claw (3) is provided with a threaded hole to connect a slide hammer to pull out the blade.

7. The tooling for extracting the locking blades of the steam turbine rotor according to claim 6, characterized in that: The second pull claw (3) is of U-shaped structure. The open end of the second pull claw (3) bends upwards to form a hook-shaped locking opening. A threaded hole is provided at the sealed end of the second pull claw (3) to connect a slide hammer.

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