Clamping device for turning inner hole of guide vane of gas turbine

Abstract

The invention discloses a clamping device for turning an inner hole of a gas turbine guide vane, and relates to the technical field of gas turbine guide vane clamps. The tool comprises a tool disc, a support check block is fixedly installed at the top of the tool disc, an upper pressing ring is fixedly installed at the top of the support check block, a plurality of sets of installation holes are formed in the tool disc in a penetrating mode, the installation holes are annularly distributed, and each set of installation holes is composed of two through holes; the axes of the two through holes are located on the outer side and the inner side of the upper pressing ring respectively, rotating shafts are rotationally installed in the through holes, semicircular supporting plates are fixedly installed at the tops of the rotating shafts, clamping protrusions are arranged at the tops of the semicircular supporting plates and are in triangular design, and the two semicircular supporting plates in the same set are symmetrically designed. And the rotating directions of the two rotating shafts on the same group of mounting holes are opposite. According to the guide vane clamping device, the guide vanes are extruded together in sequence by adopting a mode of annularly extruding and clamping multiple groups of guide vanes, the space utilization rate is high, the operation is simple, and the clamping complexity of the guide vanes is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine guide vane fixtures, and particularly to a clamping device for turning the inner hole of a gas turbine guide vane. Background Art

[0002] Before the rough machining of the guide vane part of the gas turbine guide vane blank on a CNC milling machine, the blade crown and blade root are both rough machined. Then, the outer circle of the blade crown is finish-turned on a lathe or a turning and milling machining center. The guide vane is placed on the tooling plate of the lathe. After alignment, it is ensured that the arc of the blade crown of the guide vane is concentric with the lathe faceplate (i.e., the blade is on the working pitch circle). Usually, the back arc part of the blade of the guide vane is clamped and fixed with a pressing plate, bolts, and nuts. Then, the next guide vane is aligned at a certain angle interval using the same alignment method, and so on. After all the guide vanes on the whole plate are clamped, 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 through the following technical solutions: including an upper pressing plate, a lower pressing plate, a double-headed connecting screw, an upper positioning screw, and a lower positioning screw arranged in parallel up and down; both the upper pressing plate and the lower pressing plate are isosceles triangles, and one side corresponding to the base of the isosceles triangle is arc-shaped; the upper pressing plate extends downward at the two base angles of the corresponding isosceles triangle to be provided with symmetric columnar bodies, the lower surface of the columnar body is flush with the lower surface of the lower pressing plate, a upper threaded through hole is provided at the corresponding vertex of the isosceles triangle, and an upper through hole is provided in the middle of the arc-shaped side; the lower pressing plate is provided with a lower threaded through hole at the corresponding vertex of the isosceles triangle, and a lower through hole is provided in the middle of the arc-shaped side, and the lower through hole is aligned with the upper through hole; one end of the double-headed connecting screw sequentially passes through the lower through hole and the upper through hole, and is respectively fixedly connected with the upper pressing plate and the lower pressing plate through fastening devices; the other end is provided with a thread matching the positioning screw hole on the tooling plate; 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. The following technical problems exist in the actual use process of this patent and the prior art: Although this patent can clamp four guide vanes at one time, each clamping requires manual tightening of the bolts for fixation. Manual fixation is not only difficult to control the tightening force, but also requires holding four groups of guide vanes steady when fixing, making the two guide vanes close to each other. The installation difficulty is large, and there is likely to be a gap between the two groups of guide vanes during installation, affecting the clamping stability of the guide vane. Summary of the Invention

[0004] The purpose of the present invention is: To solve the above problems, the present invention provides a clamping device for turning the inner hole of a gas turbine guide vane.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose: A clamping device for turning the inner hole of a gas turbine guide vane, comprising a tooling plate. A bracket stopper is fixedly installed on the top of the tooling plate, and an upper pressing ring is fixedly installed on the top of the bracket stopper. A plurality of groups of mounting holes are formed through the interior of the tooling plate, and the plurality of groups of mounting holes are distributed in a circular shape. Each group of mounting holes consists of two through holes, and the axes of the two through holes are respectively located outside and inside the upper pressing ring. A rotating shaft is rotatably installed in the through hole, a semi-circular supporting plate is fixedly installed on the top of the rotating shaft, and a clamping protrusion is arranged on the top of the semi-circular supporting plate. The clamping protrusion is designed in a triangular shape. The two semi-circular supporting plates in the same group are symmetrically designed, and the rotation directions of the two rotating shafts on the same group of mounting holes are opposite. The distance between the semi-circular supporting plate and the upper pressing ring is greater than the height of the guide vane; A locking threaded hole is formed at the top of the through hole. A transmission protrusion is arranged on the outer side of the rotating shaft, and a first locking sleeve is sleeved on the outer side of the rotating shaft. A guide groove is formed in the inner wall of the first locking sleeve, and the transmission protrusion is inserted into the guide groove. The first locking sleeve is threadedly connected in the locking threaded hole.

[0006] 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 plate. A driving motor is fixedly installed at the bottom of the tooling plate, a driving rocker is fixedly installed at the output end of the driving motor, and a driving rack is fixedly installed at the top of the driving rocker. The driving rack is located between the two transmission gears in the same group, and arc-shaped racks are arranged at both ends of the driving rack. The arc-shaped racks are meshed with the transmission gears.

[0007] 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.

[0008] Furthermore, a second locking sleeve is threadedly connected in the locking threaded hole at the tail end. The second locking sleeve is sleeved on the outer side of the rotating shaft and is located above the first locking sleeve.

[0009] Furthermore, friction grooves are formed on the top surface of the first locking sleeve and the bottom surface of the second locking sleeve at the tail end.

[0010] Furthermore, the outer diameter of the upper pressing ring is smaller than the outer diameter of the guide vane crown, and the inner diameter of the upper pressing ring is larger than the inner diameter of the guide vane root.

[0011] 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 pressing ring, and a sliding support rod is slidably connected in the lower guide rail. The top end of the sliding support rod is slidably connected in the upper guide rail.

[0012] Furthermore, the radian of the lower guide rail and the upper guide rail is three times the radian of the guide vane.

[0013] The beneficial effects of the present invention are as follows: In the present invention, the guide vane is inserted between the semi-circular support plate and the upper pressing ring. The two semi-circular support plates in the same group rotate synchronously and in opposite directions, and the two clamping protrusions are used to give the crown and the root of the blade a thrust away from each other. At the same time, the clamping protrusions lift the guide vane upward through the inclined surface, and the guide vane is clamped on the lower surface of the upper pressing ring, thereby automatically completing the clamping of the guide vane with high clamping efficiency.

[0014] The present invention adopts a method of annular extrusion clamping of multiple groups of guide vanes, so that the guide vanes are sequentially extruded together, with high space utilization rate, simple operation, and reduced complexity of guide vane clamping. Brief Description of the Drawings

[0015] Figure 1 is a three-dimensional structural schematic diagram of the guide vane clamping of the present invention; Figure 2 is a structural schematic diagram of the clamping device of the present invention Figure 1 ; Figure 3 is a structural schematic diagram of the clamping device of the present invention Figure 2 ; Figure 4 is a structural schematic diagram of the tooling plate of the present invention; Figure 5 is a structural schematic diagram of the starting-end semi-circular support plate of the present invention; Figure 6 is a structural schematic diagram of the tail-end semi-circular support plate of the present invention; Figure 7 is a schematic diagram of the semi-circular support plate clamping of the present invention.

[0016] Reference numerals: 1, tooling plate; 11, bracket stopper; 12, upper pressing ring; 13, mounting hole; 14, locking threaded hole; 15, lower guide rail; 16, upper guide rail; 17, sliding support rod; 2, drive motor; 3, drive rocker; 4, drive rack; 5, rotating shaft; 6, transmission gear; 7, semi-circular support plate; 71, clamping protrusion; 8, locking sleeve one; 9, locking sleeve two. Detailed Embodiments

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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.

[0018] Example 1, as Figures 1 - 7As shown in the figure, a clamping device for turning the inner hole of a gas turbine guide vane includes a tooling plate 1. A bracket stopper 11 is fixedly installed on the top of the tooling plate 1, and an upper pressing ring 12 is fixedly installed on the top of the bracket stopper 11. A plurality of groups of mounting holes 13 are penetrated through the interior of the tooling plate 1. The plurality of groups of mounting holes 13 are annularly distributed. Each group of mounting holes 13 is composed of two through holes. The axes of the two through holes are respectively located outside and inside the upper pressing ring 12. A rotating shaft 5 is rotatably installed inside the through hole. A semi-circular supporting plate 7 is fixedly installed on the top of the rotating shaft 5. A clamping protrusion 71 is arranged on the top of the semi-circular supporting plate 7. The clamping protrusion 71 is designed in a triangular shape. The two semi-circular supporting plates 7 in the same group are symmetrically designed. The rotation directions of the two rotating shafts 5 on the same group of mounting holes 13 are opposite. The distance between the semi-circular supporting plate 7 and the upper pressing ring 12 is greater than the height of the guide vane; A locking threaded hole 14 is opened at the top of the through hole. A transmission protrusion is arranged on the outer side of the rotating shaft 5. A first locking sleeve 8 is sleeved on the outer side of the rotating shaft 5. A guide groove is opened on the inner wall of the first locking sleeve 8. The transmission protrusion is inserted into the guide groove. The first locking sleeve 8 is threadedly connected in the locking threaded hole 14.

[0019] 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.

[0020] A transmission gear 6 is fixedly installed at the bottom of the rotating shaft 5. The transmission gear 6 is located at the bottom of the tooling plate 1. A driving motor 2 is fixedly installed at the bottom of the tooling plate 1. A driving rocker 3 is fixedly installed at the output end of the driving motor 2. A driving rack 4 is fixedly installed at the top of the driving rocker 3. The driving rack 4 is located between the two transmission gears 6 in the same group. Arc-shaped racks are arranged at both ends of the driving rack 4. The arc-shaped racks are meshed with the transmission gears 6.

[0021] Clamping: Insert the guide vane from the installation gap into the two semi-circular supporting plates 7 at the tail end first, 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 semi-circular supporting plate 7 and the upper pressing ring 12 is greater than the height of the guide vane, the guide vane can easily slide between the semi-circular supporting plate 7 and the upper pressing ring 12. The worker pushes the guide vane by hand to slide from the tail end to the tail end and abut against the back of the bracket stopper 11. Then, control the driving motor 2 to be powered on and rotate. The driving motor 2 drives the driving rocker 3 to rotate. The driving rocker 3 drives the driving rack 4 to rotate. The driving rack 4 drives the two transmission gears 6 at the starting end to rotate synchronously and in opposite directions through the arc-shaped racks at both ends. The single rotation angle of the driving motor 2 is fixed, and it can only drive the transmission gears 6 in the same group to rotate at a time. The two transmission gears 6 drive the two rotating shafts 5 to rotate synchronously and in opposite directions. The rotating shafts 5 drive the semi-circular supporting plates 7 to rotate synchronously and in opposite directions. As shown in the appendix Figure 7In the state shown, the two semi-circular supporting plates 7 drive the clamping protrusions 71 to respectively press against the inner sides of the crown and root of the guide vane. The clamping protrusions 71 calibrate the position of the guide vane, making the center of the guide vane located exactly in the middle of the two semi-circular supporting plates 7, achieving center line calibration. And because the two semi-circular supporting plates 7 rotate synchronously in opposite directions, it is equivalent to that two rollers will also give a thrust to the guide vane, making the guide vane press more tightly against the bracket stopper 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 tightly pressed against the upper pressure ring 12, thereby realizing automatic positioning and clamping of the guide vane; During the rotation of the rotating shaft 5, the locking sleeve one 8 is driven to rotate through the driving protrusion. The locking sleeve one 8 spirally ascends in the locking threaded hole 14. Therefore, when the driving rack 4 moves away from the transmission gear 6, under the action of the thread self-locking of the locking sleeve one 8, the rotation of the rotating shaft 5 can be restricted; Repeat the above steps to tightly press multiple guide vanes together in sequence, thereby quickly completing the clamping of the guide vanes. The clamping is simple, the clamping efficiency is high, and the space utilization rate is high. After the clamping is completed, as shown in the appendix Figure 1 In the state shown, the outer surfaces of the crown and root of the guide vane are directly exposed to the outside world, and the cutting tool can pass through the upper pressure ring 12 from above when turning the inner hole.

[0022] Embodiment 2, on the basis of the above embodiment, further includes that the inner thread of the tail end locking threaded hole 14 is threadedly connected with a locking sleeve two 9. The locking sleeve two 9 is sleeved outside the rotating shaft 5 and is located above the locking sleeve one 8.

[0023] Furthermore, friction grooves are provided on the top surface of the tail end locking sleeve one 8 and the bottom surface of the locking sleeve two 9.

[0024] After the last guide vane at the tail end is installed, the locking sleeve two 9 is rotated downward, and the locking sleeve two 9 presses on the locking sleeve one 8 to achieve double-bolt locking, further preventing the tail end guide vane from loosening during the processing. And since multiple guide vanes are pressed and fixed in sequence, other guide vanes will not loosen when the tail end does not loosen.

[0025] Embodiment 3, on the basis of the above embodiment, further includes 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. Through the design of this embodiment, the upper pressure ring 12 will not affect the turning of the guide vane.

[0026] Embodiment 4, on the basis of the above embodiment, further includes that a lower guide rail 15 is fixedly installed on the outside of the tooling plate 1, an upper guide rail 16 is fixedly installed on the top of the upper pressure ring 12, a sliding support rod 17 is slidably connected inside the lower guide rail 15, and the top end of the sliding support rod 17 is slidably connected in the upper guide rail 16.

[0027] Furthermore, the radian of the lower guide rail 15 and the upper guide rail 16 is three times that of the guide vane radian.

[0028] Through the setting of the sliding support rod 17, and in cooperation with the bracket stopper 11, support forces can be provided at both ends of the upper pressing 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, the situation of missed machining caused by the obstruction of the sliding support rod 17 will not occur.

[0029] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather 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 plate (1), characterized in that, A support stopper (11) is fixedly installed on the top of the tooling plate (1), and an upper pressing ring (12) is fixedly installed on the top of the support stopper (11). A plurality of mounting holes (13) are penetratingly formed inside the tooling plate (1), and the plurality of mounting holes (13) are annularly distributed. Each group of mounting holes (13) is composed of two through holes, and the axes of the two through holes are respectively located outside and inside the upper pressing ring (12). A rotating shaft (5) is rotatably installed inside the through hole. A semi-circular supporting plate (7) is fixedly installed on the top of the rotating shaft (5). A clamping protrusion (71) is arranged on the top of the semi-circular supporting plate (7). The clamping protrusion (71) is designed in a triangular shape. The two semi-circular supporting plates (7) in the same group are symmetrically designed. The rotation directions of the two rotating shafts (5) on the same group of mounting holes (13) are opposite. The distance between the semi-circular supporting plate (7) and the upper pressing ring (12) is greater than the height of the guide vane. A locking threaded hole (14) is formed at the top of the through hole. A transmission protrusion is arranged on the outer side of the rotating shaft (5). A first locking sleeve (8) is sleeved on the outer side of the rotating shaft (5). A guide groove is formed on the inner wall of the first locking sleeve (8). The transmission protrusion is inserted into the guide groove. The first locking sleeve (8) is threadedly connected in the locking threaded hole (14).

2. A clamping device for turning the inner hole of a gas turbine guide vane according to claim 1, characterized in that, A transmission gear (6) is fixedly installed at the bottom of the rotating shaft (5). The transmission gear (6) is located at the bottom of the tooling plate (1). A driving motor (2) is fixedly installed at the bottom of the tooling plate (1). A driving rocker (3) is fixedly installed at the output end of the driving motor (2). A driving rack (4) is fixedly installed at the top of the driving rocker (3). The driving rack (4) is located between the two transmission gears (6) in the same group. Arc-shaped racks are arranged at both ends of the driving rack (4). The arc-shaped racks are meshed with the transmission gears (6).

3. A clamping device for turning the inner hole of a gas turbine guide vane according to claim 2, characterized in that, The set of mounting holes (13) closest to the back of the support stopper (11) is the starting end, and the set of mounting holes (13) closest to the front of the support 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 support stopper (11).

4. A clamping device for turning the inner hole of a gas turbine guide vane according to claim 3, characterized in that, A second locking sleeve (9) is threadedly connected inside the locking threaded hole (14) at the tail end. The second locking sleeve (9) is sleeved on the outer side of the rotating shaft (5) and is located above the first locking sleeve (8).

5. A clamping device for turning the inner hole of a gas turbine guide vane according to claim 4, characterized in that, Friction grooves are formed on the top surface of the first locking sleeve (8) and the bottom surface of the second locking sleeve (9) at the tail end.

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

7. A clamping device for turning the inner hole of a gas turbine guide vane according to claim 6, characterized in that, 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 pressing ring (12). A sliding support rod (17) is slidably connected inside the lower guide rail (15). The top end of the sliding support rod (17) is slidably connected in the upper guide rail (16).

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

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