JP5529059B2 - Turbine blade connecting pin punching apparatus and turbine blade connecting pin punching method - Google Patents

Description

  Embodiments described herein relate generally to a turbine blade connecting pin punching device and a turbine blade connecting pin punching method.

  A main turbine in a nuclear power plant is intended to improve operational efficiency and extend its life, and for example, a turbine rotor or a nozzle diaphragm is replaced with a new part in accordance with deterioration of component parts with aging.

  At the time of parts replacement, in order to secure a storage space, the turbine rotor and the like are disassembled and decontaminated and separated. When disassembling the turbine rotor, it is necessary to extract a turbine blade connecting pin that connects the turbine blade and the rotor wheel to each other.

JP 2006-112303 A

  Here, the above-described turbine blade connecting pin is inserted into a connecting pin insertion hole formed in each fork portion of the turbine blade and the rotor wheel, and the pin end portion is fixed by a caulking structure or the like.

  Therefore, conventionally, in a narrow portion of the turbine rotor, for example, an operation of applying vibration to the end portion of the turbine blade connection pin by an air hammer or the like and gradually pushing out the turbine blade connection pin is applied.

  However, in such a working method, the end of the turbine blade connecting pin may be crushed by the impact of the air hammer, making it difficult to remove. In this case, it becomes necessary to process the collapsed portion, resulting in a decrease in workability. On the other hand, there is a concern about a burden on an operator who holds an air hammer as a vibration generation source for a relatively long time.

  The present invention has been made to solve the above-described problem, and is provided with a turbine blade connecting pin punching device and a turbine blade connecting pin that can improve work efficiency when the turbine blade connecting pin is pushed out from the turbine rotor. The purpose is to provide a punching method.

The turbine blade connecting pin punching device according to the embodiment includes a plurality of pushing pins, a pin accommodating portion, a positioning mechanism, and a pin pushing mechanism. The pin accommodating portion accommodates the plurality of extruding pins in a state where the front end surface of at least one extruding pin is exposed to the outside. A positioning mechanism positions the front-end | tip of one of the extrusion pins accommodated in the pin accommodating part in the position which opposes the end of the turbine blade connection pin inserted in the turbine rotor. The pin pushing mechanism pushes the pushing pin positioned by the positioning mechanism from the inside of the pin accommodating portion to the turbine blade connecting pin side by hydraulic pressure .

The front view which shows the turbine blade connection pin punching apparatus which concerns on embodiment. The side view which looked at the turbine blade connection pin punching device of Drawing 1 from the tip part side. The side view which looked at the turbine blade connection pin punching apparatus of FIG. 1 from the base end part side. The perspective view which looked at the turbine blade connection pin punching device of Drawing 1 from the tip part side. The perspective view which looked at the turbine blade connection pin punching apparatus of FIG. Sectional drawing which shows the structure of a turbine rotor. The disassembled perspective view which shows the structure of a turbine rotor. Sectional drawing which shows the state which positioned the extrusion pin in the position facing a turbine blade connection pin. Sectional drawing which shows the state by which the punching of the turbine blade connection pin by the extrusion pin was started. Sectional drawing which shows the state which rotated the pin cartridge and positioned another extrusion pin. Sectional drawing which shows the state by which the turbine blade connection pin was pushed out from the turbine rotor. The figure which shows typically the other supply mechanism in which a structure differs from the supply mechanism of the extrusion pin with which the turbine blade connection pin punching apparatus of FIG. 1 was provided.

Hereinafter, embodiments will be described with reference to the drawings.
As shown in FIGS. 1 to 5, a turbine blade connecting pin punching device 1 according to this embodiment includes a plurality of push pins 2, a pin cartridge 3 that functions as a pin housing portion, a positioning mechanism 5, and a pin pusher. The mechanism 7 and the frame part 6 are mainly provided.

  The turbine blade connecting pin punching device 1 is used when the turbine blade connecting pin 9 is pulled out (pulled out) from the turbine rotor 8 having the structure shown in FIGS. 6 and 7. For example, as shown in FIGS. 6 and 7, the turbine rotor 8, which is a component part of a nuclear power generation turbine, includes a rotor wheel 11 and a plurality of turbine blades 12 (and a plurality of turbine blades 14).

  A fork portion 15 is formed on the radial front end side of the rotor wheel 11. On the other hand, a fork portion 16 corresponding to the shape of the fork portion 15 is formed on the proximal end side in the radial direction of the turbine blade 12. The fork portions 15 and 16 are formed with a plurality of connection pin insertion holes 17 and 18 for inserting (inserting) the turbine blade connection pins 9 in a state where the fork portions 15 and 16 are fitted to each other. Yes.

  That is, as shown in FIGS. 6 and 7, the rotor wheel 11 and the turbine blade 12 are mutually connected by the turbine blade connection pin 9 inserted through the plurality of connection pin insertion holes 17 and 18 of the fork portions 15 and 16. It is connected. The ends of the turbine blade connecting pin 9 inserted through the connecting pin insertion holes 17 and 18 are caulked on the surface S of the rotor wheel 11, for example.

  Here, in a nuclear power plant of 1100 MWh class, for example, three low-pressure turbines may be provided, and in this case, thousands of turbine blade connecting pins 9 are used. Therefore, in such a nuclear power plant, when the turbine rotor 8 is disassembled for replacement of parts in consideration of aging deterioration, it is necessary to push out all the numerous turbine blade connecting pins 9 described above.

  Therefore, in order to increase the efficiency of the punching operation of the turbine blade connecting pin 9, the turbine blade connecting pin punching device 1 of the present embodiment is used. Further, as shown in FIG. 6, in the axial direction of the drive shaft that drives the turbine rotor 8, a size that can be disposed in a gap P (narrow portion) of, for example, about 245 mm between the turbine blades 12 and the turbine blades 14 facing each other. Thus, the turbine blade connecting pin punching device 1 is configured.

  As shown in FIGS. 1 to 5, the frame portion 6 of the turbine blade connecting pin punching device 1 holds a pin cartridge 3, a positioning mechanism 5, and a pin pushing mechanism 7. The pin cartridge 3 is formed in a cylindrical shape, and one rotating shaft 19 is fixed to the shaft core portion. The pin cartridge 3 accommodates the plurality of push pins 2 in a state in which the front end surface (2a) of at least one push pin 2 is exposed to the outside. As shown in FIG. 2, the pin cartridge 3 of the present embodiment has a structure that exposes the front end surfaces of all the push pins 2 housed inside.

  Specifically, the pin cartridge 3 has a plurality (four) of through holes 10. These through holes 10 are respectively arranged around the rotation shaft 19 as a center, and each of the plurality of extrusion pins 2 is accommodated. That is, the pin cartridge 3 has a so-called revolver structure. As shown in FIGS. 3 and 5, the pin cartridge 3 is extruded one by one from the pin loading portion 20 on the base end side of the punching device body into the through hole 10. The pin 2 can be loaded. As shown in FIGS. 2 and 4, in the turbine blade connecting pin punching device 1, it is possible to load the extrusion pins 2 into the respective through holes 10 of the pin cartridge 3 from the tip end side. is there.

  The positioning mechanism 5 has one end (base end) 9a of a turbine blade connecting pin 9 inserted into the turbine rotor 8 shown in FIG. Position it at the position to face it. More specifically, as shown in FIGS. 1 to 5, the positioning mechanism 5 includes a frame mounting mechanism 21, a rotation support mechanism 22, and a positioning pin insertion mechanism 23.

  As shown in FIGS. 5 and 6, the frame mounting mechanism 21 detachably mounts the frame portion 6 on the surface S of the rotor wheel 11 on one end surface side (base end surface side) of the turbine blade connecting pin 9. Specifically, the frame mounting mechanism 21 includes a pair of magnets 25 and a mounting lever 26. As shown in FIG. 4, by tilting the mounting lever 26, the magnet 25 slightly protrudes from the front end surface 6 a side of the frame portion 6, whereby the frame portion 6 is magnetized on the surface S of the metal rotor wheel 11. Can be fixed. On the other hand, as shown in FIGS. 1 and 5, by raising the mounting lever 26, the magnet 25 is slightly buried from the front end surface 6 a side of the frame portion 6, thereby the frame portion with respect to the surface S of the rotor wheel 11. 6 magnetic fixation can be released.

  The rotation support mechanism 22 supports the pin cartridge 3 so as to be intermittently rotatable about the rotation shaft 19 of the shaft core portion of the pin cartridge 3. Specifically, the rotation support mechanism 22 has a structure in which the load increases rapidly at a position where the pin cartridge 3 is rotated exactly 90 degrees in the rotation angle direction of the rotation shaft 19. That is, the rotation support mechanism 22 has a positional relationship in which individual through holes 10 (the push pins 2 accommodated in the through holes 10) in the pin cartridge 3 and a ram shaft 31 described later are arranged in series. (See FIG. 8A and FIG. 8C), a mechanical mechanism for generating a click feeling is provided.

  As shown in FIGS. 2 to 5, the positioning pin insertion mechanism 23 includes a pair of positioning pins 28 and a pin advance / retreat lever 29. The positioning pin insertion mechanism 23 inserts the positioning pin 28 into the connection pin insertion holes 17 and 18 after the turbine blade connection pin 9 is pushed out so as to be insertable / removable. Specifically, as shown in FIGS. 1 and 4, by twisting the pin advance / retreat lever 29 in one direction, the distal end portion of the positioning pin 28 protrudes (advances) from the distal end surface 6 a side of the frame portion 6. The frame portion 6 itself can be positioned on the surface S of the rotor wheel 11.

  In this case, as shown in FIG. 6, a predetermined pitch with respect to the pushing pin 2 in the pin cartridge 3 held on the frame portion 6 and the connecting pin insertion holes 17 and 18 after the turbine blade connecting pin 9 is pushed out. One end 9a of the turbine blade connecting pin 9 to be separated is relatively positioned. On the other hand, as shown in FIG. 4, by twisting the pin advance / retreat lever 29 to the other side, the distal end portion of the positioning pin 28 is buried (withdrawn) from the distal end surface 6 a side of the frame portion 6. The positioning of the frame part 6 itself with respect to S is released.

  The pin pushing mechanism 7 pushes the pushing pin 2 positioned by the positioning mechanism 5 from the pin cartridge 3 to the turbine blade connecting pin 9 side. Specifically, as shown in FIGS. 1 to 5, the pin pushing mechanism 7 includes a hydraulic cylinder 30, a ram shaft 31 (see FIGS. 8A to 8D), hydraulic transfer pipes 32 and 33, and a double-acting hand pump ( (Not shown). The pin pushing mechanism 7 including the hydraulic cylinder 30 is elastically supported with respect to the frame portion 6 through the plurality of springs 24 together with the pin cartridge 3 described above.

  As shown in FIGS. 8A to 8D, the ram shaft 31 strokes through one through hole 10 in the pin cartridge 3 positioned at a predetermined rotation angle by the hydraulic pressure applied from the hydraulic cylinder 30 side. . Specifically, as shown in FIG. 8D, the ram shaft 31 has a forward position where the tip of the ram shaft 31 projects from the tip side in one through hole 10, and as shown in FIGS. 8A and 8C, The tip of the ram shaft 31 moves between a retreat position in a state where the ram shaft 31 is not inserted into one through hole 10 so as to freely advance and retreat.

  Accordingly, while the pin cartridge 3 is rotated by 90 degrees intermittently and positioned, the individual push pins 2 (the base ends 2b) in the different through holes 10 in the pin cartridge 3 are replaced with the ram shafts 31 (the ends of the ram shafts 31). By sequentially extruding at 31a), as shown in FIG. 8D, a plurality of extruding pins 2 are arranged in series, whereby the turbine blade connecting pin 9 can be pushed out.

  Next, a turbine blade connecting pin punching method using the turbine blade connecting pin punching device 1 having such a structure will be described with reference to FIGS. 1 to 7 and FIGS. 8A to 8D. As shown in FIGS. 2 and 5, first, the push pins 2 are respectively inserted (accommodated) into the respective through holes 10 in the pin cartridge 3 through the pin loading portion 20 and the like.

  Next, as shown in FIG. 8A, a position in which the tip 2 a of any push pin 2 housed in the pin cartridge 3 is opposed to one end 9 a of the turbine blade connecting pin 9 inserted in the turbine rotor 8 ( A step of positioning on the surface S of the rotor wheel 11 using the positioning mechanism 5 (such as the frame mounting mechanism 21 having the magnet 25) is performed.

  Subsequently, as shown in FIG. 8B, a process of extruding the push pin 2 positioned by the positioning mechanism 5 from the pin cartridge 3 to the turbine blade connecting pin 9 side through the ram shaft 31 of the pin push mechanism 7 is performed. To do.

  Further, as shown in FIG. 8C, the above-described positioning process for another push pin 2 housed in the pin cartridge 3 (positioning another push pin 2 by rotating the pin cartridge 3 in units of 90 degrees). And a step of extruding (a step of extruding another positioned extruding pin 2 with the ram shaft 31), and as shown in FIG. Extrude completely. Thereafter, as shown in FIG. 8D, the plurality of push pins 2 arranged (inserted) in series in the connecting pin insertion holes 17 and 18 of the turbine rotor 8 are appropriately taken out, so that the turbine wheel can be removed from the rotor wheel 11 side. The wing 12 can be removed.

  As described above, according to the turbine blade connecting pin punching device 1 (and the turbine blade connecting pin punching method) of the present embodiment, the working efficiency when the turbine blade connecting pin 9 is punched from the turbine rotor 8 is improved. Can be improved. Specifically, the punching device main body can be easily set via the magnet 25 or the like, and further, the connecting pin insertion holes 17 and 18 after the turbine blade connecting pin 9 is punched are also positioned in the punching device main body. Can be used.

  Further, since the turbine blade connecting pin punching device 1 is magnetically fixed on the turbine rotor 8 via the magnet 25, the set position can be finely adjusted by hitting the device main body with a rubber hammer or the like. Further, since the tip 2a of the push pin 2 in the pin cartridge 3 is visible, the turbine blade connecting pin 9 and the push pin 2 can be easily aligned.

  In addition, the plurality of push pins 2 can be sequentially spliced by the pin cartridge 3 having a revolver structure, and as a result, the size of the punching device main body can be reduced. As a result, the punching device main body can be set in the narrow portion between the turbine blades in the axial direction of the turbine rotor 8.

  Further, by applying the turbine blade connecting pin punching device 1 having such a configuration, for example, a step of performing melt cutting of turbine parts or cutting and removing of molten metal can be omitted, and the equipment can be simplified and the number of work steps can be reduced. In addition, energy consumption can be reduced.

  Although the embodiment has been specifically described above, the constituent elements can be changed without departing from the scope of the invention in the implementation stage. For example, as shown in FIG. 9, instead of the pin cartridge 3, a supply mechanism 35 that sequentially supplies each push pin 2 to the distal end side of the ram shaft 31 while rolling a plurality of push pins 2 along the inclined surface. The turbine blade connecting pin punching device 1 may be provided.

  In the above-described embodiment, the example in which the turbine blade connecting pin punching device 1 is applied when disassembling the turbine blade from the turbine rotor 8 for nuclear power generation has been described. The turbine blade connecting pin punching device 1 can also be used for the turbine rotor of the turbine.

  DESCRIPTION OF SYMBOLS 1 ... Turbine blade connection pin punching device, 2 ... Extrusion pin, 3 ... Pin cartridge (pin accommodating part), 5 ... Positioning mechanism, 6 ... Frame part, 7 ... Pin extrusion mechanism, 8 ... Turbine rotor, 9 ... Turbine blade Connection pin, 10 ... through hole, 11 ... rotor wheel, 12, 14 ... turbine blade, 17, 18 ... connection pin insertion hole, 19 ... rotary shaft, 20 ... pin loading section, 21 ... frame mounting mechanism, 22 ... rotation support Mechanism, 23 ... Positioning pin insertion mechanism, 25 ... Magnet, 28 ... Positioning pin, 30 ... Hydraulic cylinder, 31 ... Ram shaft.

Claims (5)

A plurality of extrusion pins;
A pin accommodating portion for accommodating the plurality of extrusion pins in a state in which a tip end surface of at least one of the extrusion pins is exposed to the outside;
A positioning mechanism for positioning the tip of any of the push pins accommodated in the pin accommodating portion at a position facing the one end of the turbine blade connecting pin inserted in the turbine rotor;
A pin extruding mechanism that extrudes the extruding pin positioned by the positioning mechanism from the inside of the pin accommodating portion to the turbine blade connecting pin side by hydraulic pressure ;
A turbine blade connecting pin punching device comprising: A frame portion that holds at least the pin accommodating portion and the positioning mechanism;
The positioning mechanism includes a frame mounting mechanism including a magnet that detachably mounts the frame portion on a surface of a rotor wheel on one end surface side of the turbine blade connecting pin.
The turbine blade connecting pin punching device according to claim 1. The pin accommodating portion has a plurality of through holes that are respectively arranged around the rotation axis around the rotation axis and each of the plurality of push pins are accommodated,
The positioning mechanism includes a rotation support mechanism that supports the pin housing portion so as to be intermittently rotatable around the rotation axis.
The turbine blade connecting pin punching device according to claim 1 or 2. The positioning mechanism includes a positioning pin insertion mechanism including a positioning pin that is removably inserted into the connection pin insertion hole after the turbine blade connection pin is pushed out.
The turbine blade connecting pin punching device according to any one of claims 1 to 3. A turbine blade connecting pin push-out device including a pin housing portion that accommodates the plurality of push pins, a positioning mechanism, and a hydraulic pin push mechanism in a state in which a tip surface of at least one push pin is exposed to the outside. A method for punching a turbine blade connecting pin,
Using the positioning mechanism to position the tip of one of the extrusion pins accommodated in the pin accommodating portion at a position facing one end of a turbine blade connecting pin inserted into a turbine rotor;
A step of extruding the push pin positioned by the positioning mechanism from the pin accommodating portion to the turbine blade connecting pin side by the pin push mechanism by hydraulic pressure ;
A process of pushing out the turbine blade connecting pin from the turbine rotor by repeating the positioning step and the extruding step for another extruding pin accommodated in the pin accommodating portion;
A method for punching a turbine blade connecting pin.

Images