A device for measuring the eccentric hole on the main steam valve of a steam turbine

Abstract

The present invention belongs to the technical field of devices for measuring eccentric holes, and particularly relates to a device for measuring eccentric holes on the main steam valve of a steam turbine. Since the bottom of the conical column is conical, the conical column can automatically align itself when it extends into the vent hole, and the center of the conical column is the center of the vent hole, which is beneficial to the positioning of the center. Moreover, since the two moving rods expand synchronously to both sides through the triangular blocks, and at the same time, the square sliding rod is slidably matched with the square sleeve, when the two moving rods are tightly attached to the inner walls on both sides of the pin hole, the center line of the triangular block and the side of the scale needle opposite to the positioning plate are exactly aligned with the axis of the pin hole, which is beneficial to the positioning of the center of the pin hole. Therefore, the distance between the scale needle and the positioning plate at this time is exactly the distance between the axis of the steam turbine vent hole and the axis of the pin hole, so as to achieve the purpose of measuring the distance between the two eccentric centers.

Description

Technical Field

[0001] The present invention belongs to the technical field of devices for measuring eccentric holes, and particularly relates to a device for measuring eccentric holes on a main steam valve of a steam turbine. Background Art

[0002] In a steam turbine governing system, the main steam valve is an important part of the entire steam turbine generator system, playing a "shut-off" role in the system and being a key component of the unit to ensure the safe start-stop and operation of the unit; the main steam valve is fixed on a bracket through an eccentric pin, and the matching accuracy of the eccentric pin is directly related to the safety of the operation of the main steam valve. The size of the eccentric pin is measured after the assembly of two components; the application document with the application number 200720116472.9 discloses a measuring tool for the eccentricity of a main steam valve of a steam turbine. By setting a movable measuring cylinder and an inclined measuring block in cooperation, the measurement of the distance between the two centers of the eccentric pin is realized, and then the size of the eccentric pin is determined. The structure is simple. During the measurement process, it is necessary to ensure that the measuring tool is perpendicular to the pin hole. Without a limiting structure, there will inevitably be errors. Moreover, after taking it out, it is necessary to manually measure the extension amount of the measuring block, and errors may occur again. Therefore, it is necessary to further improve this measuring tool. Summary of the Invention

[0003] The purpose of the present invention is to provide a device for measuring eccentric holes on a main steam valve of a steam turbine in view of the problem that the existing measuring tool for eccentric pins requires manual measurement.

[0004] The present invention is realized through the following technical solutions:

[0005] A device for measuring an eccentric hole on a main steam valve of a steam turbine, comprising a cylinder body, one side of the cylinder body is provided with an opening, and bottom plates are symmetrically and fixedly arranged at both ends of the cylinder body respectively. The same longitudinal U-shaped frame is fixedly arranged on the top surfaces of the two bottom plates. The bottom surfaces of the bottom plates are aligned with the bottom end of the cylinder body. A conical column is slidably arranged in the cylinder body. The axis of the conical column is consistent with the axis of the cylinder body. A slot is also opened on the side of the conical column corresponding to the opening on the cylinder body. A plurality of T-shaped sliders are uniformly fixed on the outer circumferential surface of the conical column. T-shaped sliding grooves for the plurality of T-shaped sliders to slide are uniformly opened on the inner wall of the cylinder body, so that the conical column moves longitudinally in the cylinder body;On one side of the top surface of the conical column, a first L-shaped plate is fixed. A through groove is formed in the side wall of the vertical plate of the first L-shaped plate. A square sliding rod is slidably arranged in the through groove. One end of the square sliding rod is fixed with a handle, and the other end of the square sliding rod is fixed with a horizontal U-shaped frame. The bottom end of the horizontal U-shaped frame is fixed with a rectangular frame. Two moving rods are symmetrically arranged in the rectangular frame. The top ends of the two moving rods are both inclined. Two guide rods are respectively fixed on the opposite sides of the two moving rods. The side ends of the guide rods penetrate through the rectangular frame and are fixed with stoppers. The contact parts between the guide rods and the rectangular frame are in sliding connection. A return spring is sleeved on the guide rods between the moving rods and the inner wall of the rectangular frame. An equilateral triangular block is arranged right above the two moving rods. The two inclined surfaces on both sides of the triangular block are respectively in sliding contact with the inclined surfaces at the top ends of the two moving rods. A threaded rod is rotatably connected to the center of the top surface of the triangular block through a bearing. The top end of the threaded rod penetrates through the horizontal U-shaped frame and is in threaded connection with the contact part therewith. A turntable is fixedly sleeved on the top of the threaded rod. Two first guide rods are respectively fixed on both sides of the top surface of the triangular block. The top ends of the first guide rods penetrate through the horizontal U-shaped frame and are in sliding connection with the contact parts therewith. The top end of the threaded rod is rotatably connected to a rotating shaft through a first bearing. A disc is fixed to the top end of the rotating shaft. A scale needle is fixed to one side of the top surface of the disc. The side end surface of the scale needle is aligned with the axis of the disc. The axis of the disc, the axis of the threaded rod and the axis of the rotating shaft are the same. The bottom ends of the moving rods extend into the grooves. A second L-shaped plate is fixed to the top end of the first L-shaped plate. A first threaded rod is rotatably connected to the top end of the second L-shaped plate through a second bearing. The top end of the first threaded rod penetrates through the vertical U-shaped frame and is fixed with a first handle. The first threaded rod is in threaded connection with the contact part between the vertical U-shaped frame. A second guide rod is vertically penetrated through the vertical U-shaped frame. The bottom end of the second guide rod is fixedly connected to the top end of the second L-shaped plate. The contact part between the second L-shaped plate and the second L-shaped plate is in sliding connection. A square sleeve is slidably sleeved on the square sliding rod. A second threaded rod is rotatably connected to the center of the top surface of the square sleeve through a third bearing. The top end of the second threaded rod penetrates through the first L-shaped plate and is fixed with a second handle. The second threaded rod is in threaded connection with the contact part between the first L-shaped plate. Two third guide rods are penetrated through the first L-shaped plate. The bottom ends of the two third guide rods are respectively fixedly connected to both sides of the top surface of the square sleeve. The contact parts between the third guide rods and the first L-shaped plate are in sliding connection. A positioning plate is fixed to the side end of the first L-shaped plate. The side surface of the positioning plate is flush with the axis of the conical column. A scale plate is fixed to the side surface of the positioning plate. The scale plate is in sliding contact with the scale needle.

[0006] Preferably, the bottom plate is fixedly provided with a magnet sheet. The magnet sheet is clamped or embedded in the bottom plate, covering an area of 1 / 4 - 1 / 3 of the bottom plate. The magnet sheet includes a plurality of small pieces evenly distributed in the bottom plate, which is convenient for adsorbing to the surface of the steam turbine and improving stability.

[0007] Preferably, the zero-position scale line of the scale plate is aligned with the axis line of the conical column, so as to facilitate the measurement of the distance between the two eccentric circles.

[0008] Compared with the existing technology, the beneficial effects of the present invention are: since the bottom of the conical column of the device is conical, the conical column can be automatically aligned when it is extended into the vent hole, and the center of the conical column is the center of the vent hole, which is beneficial to the positioning of the center of the circle, and since the two moving rods expand to both sides synchronously through the triangular block, and the square sliding rod and the square sleeve slide together, when the two moving rods are tightly attached to the inner walls on both sides of the pin hole, the center line of the triangular block and the side of the ruler needle opposite to the positioning plate are just aligned with the axis of the pin hole, which is beneficial to the positioning of the center of the pin hole. Therefore, at this time, the distance between the ruler needle and the positioning plate is just the distance between the axis of the turbine vent hole and the axis of the pin hole, so that the purpose of measuring the distance between the two eccentric centers can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a structural diagram of the structure of the present invention;

[0010] Figure 2 The structure of the present invention Figure 1 A partial enlarged view of;

[0011] Figure 3 The structure of the present invention Figure 1 A top view of part of the structure.

[0012] In the figure: cylinder 1, bottom plate 2, tapered column 3, T-shaped slider 4, T-shaped slide 5, opening 6, slot 7, first L-shaped plate 8, through slot 9, square slide rod 10, handle 11, positioning plate 12, scale plate 13, square sleeve 14, third bearing 15, second threaded rod 16, second handle 17, third guide rod 18, longitudinal shaped frame 19, second L-shaped plate 20, second bearing 21, first threaded rod 22, first handle 23, second guide rod 24, transverse shaped frame 25, rectangular frame 26, triangular block 27, bearing 28, threaded rod 29, first bearing 30, rotating shaft 31, disc 32, ruler needle 33, moving rod 34, guide rod 35, stopper 36, return spring 37, rotating disk 38, first guide rod 39. Implementation

[0013] The present invention is further described below in conjunction with the accompanying drawings.

[0014] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0015] Such as Figures 1-3As shown in the figure, a tool for measuring eccentric holes on the main steam valve of a steam turbine includes a cylinder body 1. An opening 6 is provided on one side of the cylinder body 1, and bottom plates 2 are symmetrically and fixedly arranged at both ends of the cylinder body 1 respectively. The same longitudinal U-shaped frame 19 is fixedly arranged on the top surfaces of the two bottom plates 2. The bottom surface of the bottom plate 2 is aligned with the bottom end of the cylinder body 1. A tapered column 3 is slidably arranged in the cylinder body 1. The axis of the tapered column 3 is consistent with the axis of the cylinder body 1. A slot 7 is also opened on the side of the tapered column 3 corresponding to the opening 6 on the cylinder body 1. A number of T-shaped sliders 4 are evenly fixed on the outer circumferential surface of the tapered column 3. T-shaped chutes 5 for the number of T-shaped sliders 4 to slide are evenly opened on the inner wall of the cylinder body 1. A first L-shaped plate 8 is fixedly arranged on one side of the top surface of the tapered column 3. A through slot 9 is opened on the vertical plate side wall of the first L-shaped plate 8. A square slide bar 10 is slidably arranged in the through slot 9. A handle 11 is fixed at one end of the square slide bar 10. A transverse U-shaped frame 25 is fixed at the other end of the square slide bar 10. A rectangular frame 26 is fixedly arranged at the bottom end of the transverse U-shaped frame 25. Two moving rods 34 are symmetrically arranged in the rectangular frame 26. The top ends of the two moving rods 34 are both inclined. Two guide rods 35 are respectively fixed on the opposite sides of the two moving rods 34. The side ends of the guide rods 35 penetrate through the rectangular frame 26 and are fixed with stoppers 36. The contact part of the guide rods 35 and the rectangular frame 26 is in sliding connection. A return spring 37 is sleeved on the guide rods 35 between the moving rods 34 and the inner wall of the rectangular frame 26. An equilateral triangular block 27 is arranged directly above the two moving rods 34. The two inclined surfaces on both sides of the triangular block 27 are respectively in sliding fit with the inclined surfaces at the top ends of the two moving rods 34. A threaded rod 29 is rotatably connected to the center of the top surface of the triangular block 27 through a bearing 28. The top end of the threaded rod 29 penetrates through the transverse U-shaped frame 25 and is in threaded connection with the contact part therewith. A turntable 38 is fixedly sleeved at the top of the threaded rod 29. Two first guide rods 39 are respectively fixed on both sides of the top surface of the triangular block 27. The top ends of the first guide rods 39 penetrate through the transverse U-shaped frame 25 and are in sliding connection with the contact part therewith. The top end of the threaded rod 29 is rotatably connected to a rotating shaft 31 through a first bearing 30. A disc 32 is fixed at the top end of the rotating shaft 31. A scale needle 33 is fixed on one side of the top surface of the disc 32. The end face on one side of the scale needle 33 is aligned with the axis of the disc 32. The axis of the disc 32, the axis of the threaded rod 29, and the axis of the rotating shaft 31 are consistent. The bottom ends of the moving rods 34 extend into the slot 7. A second L-shaped plate 20 is fixed at the top end of the first L-shaped plate 8. A first threaded rod 22 is rotatably connected to the top end of the second L-shaped plate 20 through a second bearing 21. The top end of the first threaded rod 22 penetrates through the longitudinal U-shaped frame 19 and is fixed with a first handle 23. The contact part of the first threaded rod 22 and the longitudinal U-shaped frame 19 is in threaded connection. A second guide rod 24 is vertically penetrated through the longitudinal U-shaped frame 19. The bottom end of the second guide rod 24 is fixedly connected to the top end of the second L-shaped plate 20. The contact part of the second L-shaped plate 20 and the second L-shaped plate 20 is in sliding connection.A square sliding rod 10 is sleeved with a square sleeve 14 in a sliding manner. The center of the top end of the square sleeve 14 is rotatably connected to a second threaded rod 16 through a third bearing 15. The top end of the second threaded rod 16 penetrates through the first L-shaped plate 8 and is fixed with a second handle 17. The second threaded rod 16 is in threaded connection with the contact part of the first L-shaped plate 8. Two third guiding rods 18 are arranged through the first L-shaped plate 8. The bottom ends of the two third guiding rods 18 are respectively fixedly connected to both sides of the top surface of the square sleeve 14. The third guiding rods 18 are in sliding connection with the contact part of the first L-shaped plate 8. A positioning plate 12 is fixed to the side end of the first L-shaped plate 8. The axis of the conical column 3 is flush with the side surface of the positioning plate 12. A scale plate 13 is fixed to the side surface of the positioning plate 12. The scale plate 13 is arranged in a sliding fit with the scale needle 33. The zero scale line of the scale plate 13 is aligned with the axis of the conical column 3.,

[0016] Working principle: When the device is used, the measuring tool is placed on the vent hole of the steam turbine so that the opening 6 and the slot 7 face the direction of the pin hole, and then the first handle 23 is twisted to move the second L-shaped plate 20 downward through the first threaded rod 22. When the second L-shaped plate 20 moves downward, the conical column 3 is moved downward synchronously through the first L-shaped plate 8. The conical part at the bottom end of the conical column 3 descends into the vent hole (due to the effect of the bottom plate 2, the central axis of the conical column 3 can be ensured to be perpendicular to the eccentric hole). When the conical surface of the conical column 3 is aligned with the upper part of the vent hole, the conical part of the conical column 3 is moved downward. When the edge is pressed, stop twisting the first handle 23, then push the handle 11, move the two moving rods 34 to the top of the pin hole through the square slide bar 10, then twist the second handle 17, move the square slide bar 10 and the two moving rods 34 downward through the second threaded rod 16, until the bottom end of the moving rod 34 extends into the pin hole, then twist the threaded rod 29 through the turntable 38, so that the triangular block 27 descends, and when the triangular block 27 descends, it squeezes the two moving rods 34 to both sides synchronously until the two moving rods 34 and the inner walls on both sides of the pin hole are aligned. The distance between the two sides of the two moving rods 34 is the diameter of the pin hole. The ruler needle 33 is aligned with the axis of the pin hole toward the positioning plate 12. Therefore, the distance between the ruler needle 33 and the positioning plate 12 is exactly the distance between the axis of the turbine vent hole and the axis of the pin hole. In this way, the purpose of measuring the distance between the two eccentric circle centers can be achieved. Since the bottom of the conical column 3 is a conical setting, the conical column 3 can automatically align when it is extended into the vent hole. The center of the conical column 3 is the center of the vent hole, which is conducive to the center positioning. In addition, The two moving rods 34 are synchronously expanded to both sides through the triangular block 27, and the square slide bar 10 and the square sleeve 14 are slidably matched. When the two moving rods 34 are tightly attached to the inner walls on both sides of the pin hole, the center line of the triangular block 27 and the side of the ruler needle 33 opposite to the positioning plate 12 are just aligned with the axis of the pin hole, which is beneficial to the positioning of the center of the pin hole. Therefore, at this time, the distance between the ruler needle 33 and the positioning plate 12 is just the distance between the axis of the turbine vent hole and the axis of the pin hole, so that the purpose of measuring the distance between the two eccentric centers can be achieved. Example

[0017] On the basis of Example 1, a magnet is fixedly provided on the bottom surface of the bottom plate 2 to facilitate the entire measuring tool to be adsorbed to the surface of the steam turbine, thereby improving the stability during measurement.

[0018] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0019] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for measuring the eccentric holes on the main steam valve of a steam turbine, comprising a cylinder body (1), characterized in that, One side of the cylinder body (1) is provided with an opening (6), and bottom plates (2) are symmetrically and fixedly arranged at both ends of the cylinder body (1). The same longitudinal U-shaped frame (19) is fixedly arranged on the top surfaces of the two bottom plates (2). A conical column (3) is slidably arranged in the cylinder body (1). The axis of the conical column (3) is consistent with the axis of the cylinder body (1). A slot (7) is also formed on the side of the conical column (3) corresponding to the opening (6) on the cylinder body (1). One side of the top surface of the conical column (3) is fixedly provided with a first L-shaped plate (8). A strip-shaped through groove (9) is formed on the side wall of the vertical plate of the first L-shaped plate (8). A square sliding rod (10) is slidably arranged in the strip-shaped through groove (9). One end of the square sliding rod (10) is fixedly provided with a handle (11). The other end of the square sliding rod (10) is fixedly provided with a transverse U-shaped frame (25). The bottom end of the transverse U-shaped frame (25) is fixedly provided with a rectangular frame (26). Two moving rods (34) are symmetrically arranged in the rectangular frame (26). The top ends of the two moving rods (34) are both inclined. Two guide rods (35) are respectively fixedly arranged on the opposite sides of the two moving rods (34). A triangular block (27) is arranged at the upper right ends of the two moving rods (34). The triangular block (27) is an equilateral triangle. The two inclined surfaces on both sides of the triangular block (27) are respectively in sliding contact with the inclined surfaces at the top ends of the two moving rods (34). The center of the top surface of the triangular block (27) is rotationally connected with a threaded rod (29) through a bearing (28). The top end of the threaded rod (29) penetrates through the transverse U-shaped frame (25) and is in threaded connection with the contact part thereof. A turntable (38) is fixedly sleeved on the top of the threaded rod (29). The top end of the threaded rod (29) is rotationally connected with a rotating shaft (31) through a first bearing (30). A disc (32) is fixedly arranged at the top end of the rotating shaft (31). A scale needle (33) is fixedly arranged on one side of the top surface of the disc (32). The bottom ends of the moving rods (34) extend into the slot (7). The top end of the first L-shaped plate (8) is fixedly provided with a second L-shaped plate (20). The top end of the second L-shaped plate (20) is rotationally connected with a first threaded rod (22) through a second bearing (21). The top end of the first threaded rod (22) penetrates through the longitudinal U-shaped frame (19) and is fixedly provided with a first handle (23). The first threaded rod (22) is in threaded connection with the contact part of the longitudinal U-shaped frame (19). A square sleeve (14) is slidably sleeved on the square sliding rod (10). The center of the top end of the square sleeve (14) is rotationally connected with a second threaded rod (16) through a third bearing (15). The top end of the second threaded rod (16) penetrates through the first L-shaped plate (8) and is fixedly provided with a second handle (17). The second threaded rod (16) is in threaded connection with the contact part of the first L-shaped plate (8). A positioning plate (12) is fixedly arranged at the side end of the first L-shaped plate (8). The side surface of the positioning plate (12) is flush with the axis line of the conical column (3). A scale plate (13) is fixedly arranged on the side surface of the positioning plate (12). The scale plate (13) is in sliding contact with the scale needle (33); The side end of the guiding rod (35) penetrates through the rectangular frame (26) and is fixed with a stopper (36). The guiding rod (35) is slidably connected to the contact part with the rectangular frame (26). A return spring (37) is sleeved on the guiding rod (35) between the moving rod (34) and the inner wall of the rectangular frame (26). On both sides of the top surface of the triangular block (27), a first guiding rod (39) is respectively fixed. The top end of the first guiding rod (39) penetrates through the horizontal U-shaped frame (25) and is slidably connected to the contact part therewith.

2. The device for measuring the eccentric hole on the main steam valve of a steam turbine according to claim 1, wherein The bottom surface of the bottom plate (2) is on the same horizontal plane as the bottom end of the cylinder body (1).

3. The device for measuring the eccentric hole on the main steam valve of a steam turbine according to claim 2, characterized in that, A magnet sheet is fixedly arranged on the bottom surface of the bottom plate (2).

4. The device for measuring the eccentric hole on the main steam valve of a steam turbine according to claim 1, characterized in that A plurality of T-shaped sliders (4) are evenly fixed on the outer circumferential surface of the conical column (3). A plurality of T-shaped sliding grooves (5) for the T-shaped sliders (4) to slide are evenly formed on the inner wall of the cylinder body (1).

5. The device for measuring the eccentric hole on the main steam valve of a steam turbine according to claim 1, characterized in that One side end face of the scale needle (33) is aligned with the axis line of the disc (32). The axis lines of the disc (32), the threaded rod (29), and the rotating shaft (31) are the same.

6. The device for measuring the eccentric hole on the main steam valve of a steam turbine according to claim 1, wherein A second guiding rod (24) is vertically penetrated through the longitudinal U-shaped frame (19). The bottom end of the second guiding rod (24) is fixedly connected to the top end of the second L-shaped plate (20).

7. The device for measuring the eccentric hole on the main steam valve of a steam turbine according to claim 1, characterized in that, Two third guiding rods (18) are penetrated through the first L-shaped plate (8). The bottom ends of the two third guiding rods (18) are respectively fixedly connected to both sides of the top surface of the square sleeve (14). The third guiding rod (18) is slidably connected to the contact part with the first L-shaped plate (8).

8. The device for measuring the eccentric hole on the main steam valve of a steam turbine according to claim 1, wherein, The zero scale line of the scale plate (13) is aligned with the axis line of the conical column (3).

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