A clamping device for turning inner holes of gas turbine guide vanes

Abstract

The present invention discloses a clamping device for turning the inner hole of a gas turbine guide vane, and relates to the technical field of gas turbine guide vane fixtures. The present invention comprises a tooling disk, a bracket block is fixedly installed on the top of the tooling disk, an upper pressure ring is fixedly installed on the top of the bracket block, and multiple groups of mounting holes are provided inside the tooling disk. The multiple groups of mounting holes are distributed in an annular pattern, and each group of mounting holes consists of two through holes. The axes of the two through holes are respectively located on the outside and inside of the upper pressure ring. A rotating shaft is rotatably installed inside the through hole, and a semicircular support plate is fixedly installed on the top of the rotating shaft. A clamping protrusion is provided on the top of the semicircular support plate. The clamping protrusion is designed in a triangular shape. The two semicircular support plates in the same group are symmetrically designed, and the two rotating shafts on the same group of mounting holes turn in opposite directions. The present invention adopts a method of annular extrusion and clamping of multiple groups of guide vanes, so that the guide vanes are squeezed together in sequence, which has high space utilization, simple operation, and reduces the complexity of guide vane clamping.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbine guide vane clamps, and in particular to a clamping device for turning inner holes of gas turbine guide vanes. Background Art

[0002] Before the CNC milling machine finishes the guide blade part of the gas turbine guide blade blank, the blade crown and blade root are rough-machined, and then the outer circle of the blade crown is fine-machined on a lathe or a turning and milling machining center. The guide vane is placed on the tooling disk of the lathe. After alignment, it is ensured that the arc of the guide vane's blade crown is concentric with the machine tool disk (that is, the blade is on the working pitch circle). Usually, the back arc of the guide vane is tightened and fixed with a pressure plate, bolts and nuts, and then the next guide vane is aligned using the same alignment method at a certain interval. And so on, the entire plate of guide vanes is clamped and the outer circle of the blade crown is turned.

[0003] In a Chinese patent (publication number: CN109968084B), a clamping device for turning the inner hole of a gas turbine guide vane is disclosed, which is realized by the following technical solution: comprising: an upper laminate, a lower laminate, a double-headed connecting screw, an upper positioning screw and a lower positioning screw arranged in parallel; the upper laminate and the lower laminate are both isosceles triangles, and the sides corresponding to the base of the isosceles triangle are both arc-shaped; the upper laminate is provided with symmetrical columns extending downward at the two base angles of the corresponding isosceles triangle, and the lower surface of the column is flush with the lower surface of the lower laminate, corresponding to the isosceles triangle. An upper threaded through hole is provided at the vertex, and an upper through hole is provided in the middle of one side of the arc; the lower laminate is provided with a lower threaded through hole at the vertex of the isosceles triangle corresponding to the lower laminate, and a lower through hole is provided in the middle of one side of the arc, and the lower through hole is aligned with the upper through hole; one end of the double-headed connecting screw passes through the lower through hole and the upper through hole in sequence, and is fastened to the upper laminate and the lower laminate respectively through a fastening device; the other end is provided with a thread that matches the positioning screw hole on the tooling disk; the threaded end of the upper positioning screw passes through the upper threaded through hole and matches it; the threaded end of the lower positioning screw passes through the lower threaded through hole and matches it. This patent and the existing technology have the following technical problems in actual use: Although this patent can achieve the clamping of four guide vanes at a time, each clamping requires manual tightening of the bolts for fixing. Manual fixing is not only difficult to control the tightening force, but also requires holding the four groups of guide vanes steady when fixing, so that the two guide vanes are close together, which is difficult to install. During installation, gaps are likely to appear between the two groups of guide vanes, affecting the stability of the guide vane clamping. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and provide a clamping device for turning the inner hole of a gas turbine guide vane.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A clamping device for turning the inner hole of a gas turbine guide vane comprises a tooling disc, a bracket block is fixedly installed on the top of the tooling disc, an upper pressure ring is fixedly installed on the top of the bracket block, a plurality of groups of mounting holes are provided through the interior of the tooling disc, the plurality of groups of mounting holes are distributed in an annular manner, each group of mounting holes consists of two through holes, the axes of the two through holes are respectively located on the outer side and the inner side of the upper pressure ring, a rotating shaft is rotatably installed inside the through hole, a semicircular supporting plate is fixedly installed on the top of the rotating shaft, a clamping protrusion is provided on the top of the semicircular supporting plate, the clamping protrusion is triangular in design, the two semicircular supporting plates in the same group are symmetrically designed, the two rotating shafts on the same group of mounting holes turn in opposite directions, and the distance between the semicircular supporting plate and the upper pressure ring is greater than the height of the guide vane;

[0007] A locking threaded hole is provided at the top of the through hole, a transmission protrusion is provided on the outside of the rotating shaft, a locking screw sleeve is sleeved on the outside of the rotating shaft, a guide groove is provided on the inner wall of the locking screw sleeve, the transmission protrusion is inserted in the guide groove, and the locking screw sleeve is threadedly connected to the locking threaded hole.

[0008] Furthermore, a transmission gear is fixedly installed at the bottom of the rotating shaft, and the transmission gear is located at the bottom of the tooling disk. A driving motor is fixedly installed at the bottom of the tooling disk, and a driving rocker is fixedly installed at the output end of the driving motor. A driving rack is fixedly installed on the top of the driving rocker, and the driving rack is located between two transmission gears in the same group. Arc-shaped racks are provided at both ends of the driving rack, and the arc-shaped racks are meshed with the transmission gear.

[0009] Furthermore, the group of mounting holes closest to the back of the bracket stopper is the starting end, and the group of mounting holes closest to the front of the bracket stopper is the tail end. When the guide vane is installed at the tail end, there is an installation gap between it and the bracket stopper.

[0010] Furthermore, the internal thread of the locking threaded hole at the tail end is connected to a locking screw sleeve 2, and the locking screw sleeve 2 is sleeved on the outside of the rotating shaft and is located above the locking screw sleeve 1.

[0011] Furthermore, friction grooves are provided on the top surface of the locking screw sleeve 1 and the bottom surface of the locking screw sleeve 2 at the tail end.

[0012] Furthermore, the outer diameter of the upper pressure ring is smaller than the outer diameter of the guide vane crown, and the inner diameter of the upper pressure ring is larger than the inner diameter of the guide vane root.

[0013] Furthermore, a lower guide rail is fixedly installed on the outer side of the tooling plate, an upper guide rail is fixedly installed on the top of the upper pressure ring, a sliding support rod is slidably connected inside the lower guide rail, and the top end of the sliding support rod is slidably connected to the upper guide rail.

[0014] Furthermore, the curvature of the lower guide rail and the upper guide rail is three times the curvature of the guide vane.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention inserts the guide vane between the semicircular support plate and the upper pressure ring, and the two semicircular support plates in the same group rotate synchronously in opposite directions. The two clamping protrusions are used to give the blade crown and the blade root a thrust away from each other. At the same time, the clamping protrusion lifts the guide vane upward through the inclined surface, clamps the guide vane on the lower surface of the upper pressure ring, and automatically completes the guide vane clamping with high clamping efficiency.

[0017] The present invention adopts a method of annularly extruding and clamping multiple groups of guide vanes, so that the guide vanes are squeezed together in sequence, which has high space utilization, simple operation and reduces the complexity of guide vane clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the gas turbine guide vane clamping of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the clamping device of the present invention Figure 1 ;

[0020] Figure 3 This is a schematic diagram of the structure of the clamping device of the present invention Figure 2 ;

[0021] Figure 4 It is a schematic diagram of the structure of the tooling tray of the present invention;

[0022] Figure 5 This is a schematic diagram of the semicircular support plate structure at the starting end of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the semicircular support plate at the tail end of the present invention;

[0024] Figure 7 It is a schematic diagram of the semicircular support plate clamping of the present invention.

[0025] Figure numerals: 1. tooling plate; 11. bracket block; 12. upper pressure ring; 13. mounting hole; 14. locking threaded hole; 15. lower guide rail; 16. upper guide rail; 17. sliding support rod; 2. driving motor; 3. driving rocker; 4. driving gear rod; 5. rotating shaft; 6. transmission gear; 7. semicircular support plate; 71. clamping protrusion; 8. locking screw sleeve 1; 9. locking screw sleeve 2. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0027] Example 1, as Figure 1-Figure 7As shown, a clamping device for turning the inner hole of a gas turbine guide vane comprises a tooling disc 1, a bracket block 11 is fixedly mounted on the top of the tooling disc 1, an upper pressure ring 12 is fixedly mounted on the top of the bracket block 11, a plurality of groups of mounting holes 13 are provided through the interior of the tooling disc 1, and the plurality of groups of mounting holes 13 are distributed in an annular shape, each group of mounting holes 13 consists of two through holes, the axes of the two through holes are respectively located on the outside and inside of the upper pressure ring 12, a rotating shaft 5 is rotatably mounted inside the through hole, a semicircular supporting plate 7 is fixedly mounted on the top of the rotating shaft 5, a clamping protrusion 71 is provided on the top of the semicircular supporting plate 7, and the clamping protrusion 71 is designed in a triangular shape, and the two semicircular supporting plates 7 in the same group are symmetrically designed, the two rotating shafts 5 on the same group of mounting holes 13 turn in opposite directions, and the distance between the semicircular supporting plate 7 and the upper pressure ring 12 is greater than the guide vane height;

[0028] A locking threaded hole 14 is provided at the top of the through hole, a transmission protrusion is provided on the outside of the rotating shaft 5, a locking screw sleeve 8 is sleeved on the outside of the rotating shaft 5, a guide groove is provided on the inner wall of the locking screw sleeve 8, the transmission protrusion is inserted in the guide groove, and the locking screw sleeve 8 is threadedly connected to the locking threaded hole 14.

[0029] The group of mounting holes 13 closest to the back of the bracket stopper 11 is the starting end, and the group of mounting holes 13 closest to the front of the bracket stopper 11 is the tail end. When the guide vane is installed at the tail end, there is an installation gap between it and the bracket stopper 11.

[0030] A transmission gear 6 is fixedly installed at the bottom of the rotating shaft 5, and the transmission gear 6 is located at the bottom of the tooling disk 1. A driving motor 2 is fixedly installed at the bottom of the tooling disk 1. A driving rocker 3 is fixedly installed at the output end of the driving motor 2. A driving rack 4 is fixedly installed on the top of the driving rocker 3. The driving rack 4 is located between two transmission gears 6 in the same group. Arc racks are provided at both ends of the driving rack 4, and the arc racks are meshed with the transmission gear 6.

[0031] After the guide vane is installed, it first enters the two semicircular support plates 7 at the tail end, and the two clamping protrusions 71 enter between the blade crown and the blade root. The two clamping protrusions 71 play a guiding role. Since the distance between the semicircular support plate 7 and the upper pressure ring 12 is greater than the guide vane height, the guide vane can easily slide between the semicircular support plate 7 and the upper pressure ring 12. The worker pushes the guide vane from the tail end to the tail end and presses against the back of the bracket block 11 by hand, and then controls the drive motor 2 to energize and rotate. The drive motor 2 drives the drive rocker 3 to rotate, and the drive rocker 3 drives the drive rack 4 to rotate. The drive rack 4 drives the two transmission gears 6 at the starting end to rotate synchronously in the opposite direction through the arc racks at both ends. The single rotation angle of the drive motor 2 is fixed, and it can only drive the transmission gear 6 of the same group to rotate at a time. The two transmission gears 6 drive the two rotating shafts 5 to rotate synchronously in the opposite direction, and the rotating shaft 5 drives the semicircular support plates 7 to rotate synchronously in the opposite direction, as shown in the attached figure. Figure 7In the state shown, the two semicircular supporting plates 7 drive the clamping protrusions 71 to press against the blade crown and the inner side of the blade root of the guide vane respectively, and the clamping protrusions 71 calibrate the position of the guide vane so that the center of the guide vane is located in the middle of the two semicircular supporting plates 7, thereby realizing centerline calibration. Moreover, since the two semicircular supporting plates 7 rotate synchronously in opposite directions, the two rollers also give thrust to the guide vane, so that the guide vane is pressed more tightly against the bracket block 11. At the same time, under the action of the inclined surface of the clamping protrusion 71, the clamping protrusion 71 lifts the guide vane upward, and the guide vane is finally pressed tightly against the upper pressure ring 12, thereby realizing automatic positioning and clamping of the guide vane.

[0032] During the rotation of the shaft 5, the locking screw sleeve 8 is driven to rotate via the transmission protrusion, and the locking screw sleeve 8 spirally rises in the locking threaded hole 14. Therefore, when the driving gear rod 4 moves away from the transmission gear 6, the locking screw sleeve 8 self-locks and can limit the rotation of the shaft 5.

[0033] Repeat the above steps to press the guide vanes together in a circular manner, and then quickly complete the guide vane clamping. The clamping is simple, efficient, and space-utilization-efficient. After the clamping is completed, as shown in the attached Figure 1 In the state shown, the outer surfaces of the blade crown and blade root of the guide vane are directly exposed to the outside world, and when turning the inner hole, the tool only needs to pass through the upper pressure ring 12 from above.

[0034] Embodiment 2, based on the above embodiment, further includes that the internal thread of the tail end locking threaded hole 14 is connected with a locking screw sleeve 2 9, and the locking screw sleeve 2 9 is sleeved on the outside of the rotating shaft 5 and is located above the locking screw sleeve 1 8.

[0035] Furthermore, friction grooves are provided on the top surface of the tail end locking screw sleeve 1 8 and the bottom surface of the locking screw sleeve 2 9.

[0036] After the installation of the last guide vane at the tail end is completed, screw down the locking screw sleeve 2 9, and press the locking screw sleeve 2 9 on the locking screw sleeve 1 8 to achieve double-bolt locking, further preventing the tail end guide vane from loosening during the processing. The multiple guide vanes are tightened and fixed in sequence, so when the tail end is not loose, the other guide vanes will not loosen either.

[0037] Embodiment 3, based on the above embodiment, further includes: the outer diameter of the upper pressure ring 12 is smaller than the outer diameter of the guide vane crown, and the inner diameter of the upper pressure ring 12 is larger than the inner diameter of the guide vane root. Through the design of this embodiment, the upper pressure ring 12 does not affect the turning of the guide vane.

[0038] Embodiment 4, based on the above embodiment, further includes: a lower guide rail 15 is fixedly installed on the outer side of the tooling plate 1, an upper guide rail 16 is fixedly installed on the top of the upper pressure ring 12, and a sliding support rod 17 is slidably connected to the inside of the lower guide rail 15, and the top end of the sliding support rod 17 is slidably connected to the upper guide rail 16.

[0039] Furthermore, the curvature of the lower guide rail 15 and the upper guide rail 16 is three times the curvature of the guide vane.

[0040] By setting the sliding support rod 17 and cooperating with the bracket block 11, supporting force can be provided for both ends of the upper pressure ring 12, and the sliding support rod 17 can slide along the lower guide rail 15 and the upper guide rail 16. When turning the outer surface of the guide vane crown, there will be no omission in processing due to the obstruction of the sliding support rod 17.

[0041] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A clamping device for turning the inner hole of a gas turbine guide vane, comprising a tooling disc (1), characterized in that: A bracket block (11) is fixedly installed on the top of the tooling disc (1), and an upper pressure ring (12) is fixedly installed on the top of the bracket block (11). A plurality of groups of mounting holes (13) are provided inside the tooling disc (1), and the plurality of groups of mounting holes (13) are distributed in an annular manner. Each group of mounting holes (13) consists of two through holes, and the axes of the two through holes are respectively located on the outside and the inside of the upper pressure ring (12). A rotating shaft (5) is rotatably installed inside the through hole, and a semicircular support plate (7) is fixedly installed on the top of the rotating shaft (5). A clamping protrusion (71) is provided on the top of the semicircular support plate (7), and the clamping protrusion (71) is triangular in design. The two semicircular support plates (7) in the same group are symmetrically designed. The two rotating shafts (5) on the same group of mounting holes (13) turn in opposite directions, and the distance between the semicircular support plate (7) and the upper pressure ring (12) is greater than the height of the guide vane. A locking threaded hole (14) is provided at the top of the through hole, a transmission protrusion is provided on the outer side of the rotating shaft (5), a locking screw sleeve (8) is sleeved on the outer side of the rotating shaft (5), a guide groove is provided on the inner wall of the locking screw sleeve (8), the transmission protrusion is inserted into the guide groove, and the locking screw sleeve (8) is threadedly connected to the locking threaded hole (14).

2. A clamping device for turning inner holes of gas turbine guide vanes according to claim 1, characterized in that: A transmission gear (6) is fixedly mounted on the bottom of the rotating shaft (5), and the transmission gear (6) is located at the bottom of the tooling disk (1). A driving motor (2) is fixedly mounted on the bottom of the tooling disk (1), and a driving rocker (3) is fixedly mounted on the output end of the driving motor (2). A driving gear rod (4) is fixedly mounted on the top of the driving rocker (3). The driving gear rod (4) is located between two transmission gears (6) in the same group, and arc-shaped racks are provided at both ends of the driving gear rod (4), which mesh with the transmission gear (6).

3. A clamping device for turning inner holes of gas turbine guide vanes according to claim 2, characterized in that: The group of mounting holes (13) closest to the back of the bracket stopper (11) is the starting end, and the group of mounting holes (13) closest to the front of the bracket stopper (11) is the tail end. When the guide vane is installed at the tail end, there is an installation gap between it and the bracket stopper (11).

4. A clamping device for turning inner holes of gas turbine guide vanes according to claim 3, characterized in that: The internal thread of the locking threaded hole (14) at the tail end is connected with a locking screw sleeve 2 (9), and the locking screw sleeve 2 (9) is sleeved on the outside of the rotating shaft (5) and is located above the locking screw sleeve 1 (8).

5. A clamping device for turning inner holes of gas turbine guide vanes according to claim 4, characterized in that: The top surface of the locking screw sleeve 1 (8) at the tail end and the bottom surface of the locking screw sleeve 2 (9) are both provided with friction grooves.

6. A clamping device for turning inner holes of gas turbine guide vanes according to claim 5, characterized in that: The outer diameter of the upper pressure ring (12) is smaller than the outer diameter of the guide vane crown, and the inner diameter of the upper pressure ring (12) is larger than the inner diameter of the guide vane root.

7. A clamping device for turning inner holes of gas turbine guide vanes according to claim 6, characterized in that: A lower guide rail (15) is fixedly mounted on the outer side of the tooling plate (1), an upper guide rail (16) is fixedly mounted on the top of the upper pressure ring (12), a sliding support rod (17) is slidably connected to the interior of the lower guide rail (15), and the top end of the sliding support rod (17) is slidably connected to the upper guide rail (16).

8. The clamping device for turning the inner hole of a gas turbine guide vane according to claim 7, characterized in that: The curvature of the lower guide rail (15) and the upper guide rail (16) is three times the curvature of the guide vane.

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