Duplex precision casting guide vane clamping device

Abstract

The invention discloses a duplex precision casting guide vane clamping device, relates to the technical field of gas turbine guide vane clamping, and aims to solve the problems that a set of special fixture and measuring tool is needed for machining each part due to the fact that the gas turbine guide vane needs to be machined in sequence at present, the clamping frequency is high, the reference conversion is frequent, and the machining cost is high. The large-head air outlet side pressure plate comprises a bottom plate, a large-head positioning plate, a bolt I, a nut I, a large-head pressure plate, a small-head positioning seat, a bolt II, a nut II, a small-head pressure plate, a bolt III, a nut III and a small-head air outlet side pressure plate, and the large-head positioning plate, the bolt I, the nut I, the large-head pressure plate, the small-head positioning seat, the bolt II, the nut II, the small-head pressure plate and the small-head air outlet side pressure plate are arranged on the bottom plate. A large-head positioning plate is fixed to the left side of the upper end face of the bottom plate, two clamping jaws are arranged on a large-head pressing plate at intervals, a bolt I is fixed to the upper end face of the bottom plate, and the large-head pressing plate is slidably connected to the bolt I. The clamp is used for clamping the turbine guide vane of the gas turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine turbine guide vane clamping, and in particular to a double precision-cast guide vane clamping device. Background Art

[0002] A gas turbine's turbine guide vanes are key stationary components within the turbine stage. Installed ahead of the rotor blades, their primary function is to efficiently convert the heat energy of high-temperature, high-pressure gas into kinetic energy. They also precisely guide the airflow so that it strikes the blades at the optimal angle, driving the rotor's rotation and generating power. Their design directly impacts the efficiency, power, and reliability of the gas turbine.

[0003] The inner and outer edge plates of gas turbine guide vanes are relatively thin. To increase the rigidity of the edge plates, rib structures are designed at the ends of the inner and outer edge plates. Due to the complex structure of the rib plates and the difficulty of machining, it is impossible to reserve process clamping handles at the ends of the inner and outer edge plates during casting, resulting in difficult blade clamping and low automation. Current processing uses sequential processing, requiring a set of dedicated fixtures and measuring tools for each part, requiring frequent clamping and datum conversions. This further leads to large dimensional deviations in various parts of the blade and low processing accuracy. During assembly, the radial surface of the blade needs to be repeatedly ground to meet assembly requirements. Summary of the Invention

[0004] The present invention aims to solve the problem that the machining of gas turbine guide vanes requires sequential machining, so each part requires a set of special fixtures and measuring tools, the clamping times are large, the reference conversions are frequent, and further lead to large dimensional deviations of various parts of the blades, low machining accuracy, and the need for repeated grinding of the radial surfaces of the blades to meet the assembly requirements during assembly. The present invention further provides a double-link precision casting guide vane clamping device to solve the problems raised in the above-mentioned background technology.

[0005] The technical solution of the present invention is:

[0006] A double precision-cast guide vane clamping device, comprising a base plate, a large head positioning plate, bolts I, nuts I, a large head pressure plate, a small head positioning seat, bolts II, nuts II, a small head pressure plate, bolts III, nuts III and a small head outlet side pressure plate;

[0007] A large head positioning plate is fixed to the left side of the upper end surface of the base plate, two clamping claws are arranged at intervals on the large head pressure plate, a bolt I is fixed to the upper end surface of the base plate, the large head pressure plate is slidably connected to the bolt I, a nut I is threadedly connected to the bolt I, and the large head pressure plate is installed above the large head positioning plate in an adjustable height through the nut I;

[0008] A small head positioning seat is fixed on the right side of the upper end surface of the bottom plate, and a positioning block protruding from the left end surface of the small head positioning seat is provided on the small head positioning seat. Bolt II is fixed on the small head positioning seat, and the small head pressure plate is slidably connected to the bolt II. Nut II is threadedly connected to the bolt II. The small head pressure plate is installed above the small head positioning seat in an adjustable height through nut II.

[0009] Two bolts III are fixed on the bottom plate, each bolt III is threadedly connected with a nut III, and a small-head air outlet side pressure plate is slidably connected to the two bolts III. The small-head air outlet side pressure plate is installed above the bottom plate in an adjustable height through the nut III.

[0010] Furthermore, two inner radial positioning seats are provided on the base plate, and an inclined end face is provided on the inner radial positioning seat. A bolt IV is threadedly connected to the inclined end face, and a nut IV is threadedly connected to the bolt IV for fixing the bolt IV and the inclined end face.

[0011] Furthermore, two airway back arc positioning pins are provided on the transverse midline of the base plate.

[0012] Furthermore, two small head edge plate arc positioning pins are fixed on the bottom plate, and the small head edge plate arc positioning pins are arranged on the left side of the small head positioning seat.

[0013] Furthermore, a waist-shaped hole I is provided on the big-head pressure plate, and the bolt I passes through the big-head pressure plate through the waist-shaped hole I; a waist-shaped hole II is provided on the small-head pressure plate, and the bolt II passes through the small-head pressure plate through the waist-shaped hole II.

[0014] Furthermore, a support screw I is fixed to the lower end of the large head pressure plate, and the lower end of the support screw I is against the bottom plate; a support screw II is fixed to the lower end of the small head pressure plate, and the lower end of the support screw II is against the small head positioning seat.

[0015] Furthermore, the left end surfaces of the small head positioning seat and the positioning block are configured to be arc-shaped.

[0016] Furthermore, the inclination angle between the inclined end surface of the inner radial positioning seat and the bottom plate is 55°.

[0017] Furthermore, the positioning block is provided with a plurality of empty knife grooves.

[0018] Furthermore, two airway pressure plate screws are fixed to the upper end surface of the base plate.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. A double-jointed precision-cast guide vane clamping device is provided with a large-end pressure plate, a small-end pressure plate, and a small-end outlet side pressure plate, with three pressure plates for clamping and fixing the gas turbine turbine guide vanes. During processing, the large-end pressure plate and the small-end pressure plate are first used to fix the gas turbine turbine guide vanes, and the large-end outlet side arc positioning groove, axial positioning groove and outlet side plane, small-end outlet side plane, and large and small end back radial positions can be processed; after processing is completed, the small-end outlet side pressure plate is installed and removed, and the outlet side and both sides of the pin can be processed. In one clamping, the gas turbine turbine guide vanes can be fixed and clamped by replacing the small-end pressure plate and the small-end outlet side pressure plate, and multiple positions can be processed, thus realizing semi-integrated processing of the blades, shortening the process flow, and greatly improving the processing accuracy of the blades by reducing the reference conversion.

[0021] 2. An inner radial locating seat is provided to provide auxiliary support for the inner radial direction of the large and small head edge plates, preventing blade displacement during machining when the clamping force alone is insufficient to resist the machining resistance of the machine tool. By adjusting the height of bolt IV on the inner radial locating seat, auxiliary support can be provided for the inner radial direction of the large and small head edge plates of gas turbine guide vanes of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure diagram of the present invention after clamping the gas turbine guide vane Figure I ;

[0023] Figure 2 The structure diagram of the present invention after clamping the gas turbine guide vane Figure II ;

[0024] Figure 3 The overall structure of the present invention is schematically shown Figure I ;

[0025] Figure 4 The overall structure of the present invention is schematically shown Figure II ;

[0026] Figure 5 This is a structural diagram of the airway back arc positioning pin and the small head edge plate arc positioning pin;

[0027] Figure 6 Schematic diagram of the structure of the big head pressure plate Figure I ;

[0028] Figure 7 Schematic diagram of the structure of the big head pressure plate Figure II ;

[0029] Figure 8 This is a structural diagram of the small head positioning seat;

[0030] Figure 9 It is a structural diagram of an empty knife groove;

[0031] Figure 10 It is a structural diagram of the inner radial positioning seat.

[0032] In the figure: 1. Base plate; 201. Big head positioning plate; 202. Bolt I; 203. Nut I; 204. Big head pressure plate; 205. Clamp; 301. Small head positioning seat; 302. Positioning block; 303. Bolt II; 304. Nut II; 305. Small head pressure plate; 401. Bolt III; 402. Nut III; 403. Small head outlet side pressure plate; 501. Inner radial positioning seat; 502. Inclined end face; 503. Bolt IV; 504. Nut IV; 6. Airway back arc positioning pin; 7. Small head edge plate arc positioning pin; 206. Support screw I; 306. Support screw II; 307. Empty knife groove; 8. Airway pressure plate screw. DETAILED DESCRIPTION

[0033] Specific implementation method 1: See Figure 1-5 As shown, a double-linked precision-cast guide vane clamping device, in this embodiment, includes a base plate 1, a large-end positioning plate 201, bolts I 202, nuts I 203, a large-end pressure plate 204, a small-end positioning seat 301, bolts II 303, nuts II 304, a small-end pressure plate 305, bolts III 401, nuts III 402, and a small-end outlet side pressure plate 403;

[0034] A large head positioning plate 201 is fixed to the left side of the upper end surface of the base plate 1. Two clamping claws 205 are spaced apart on the large head pressure plate 204. A bolt I 202 is fixed to the upper end surface of the base plate 1. The large head pressure plate 204 is slidably connected to the bolt I 202. A nut I 203 is threadedly connected to the bolt I 202. The large head pressure plate 204 is installed above the large head positioning plate 201 with the help of the nut I 203 so that its height can be adjusted.

[0035] A small head positioning seat 301 is fixed to the right side of the upper end face of the base plate 1. A positioning block 302 protruding from the left end face of the small head positioning seat 301 is provided on the small head positioning seat 301. A bolt II 303 is fixed to the small head positioning seat 301. A small head pressure plate 305 is slidably connected to the bolt II 303. A nut II 304 is threadedly connected to the bolt II 303. The small head pressure plate 305 is installed above the small head positioning seat 301 in a height-adjustable manner through the nut II 304.

[0036] Two bolts III 401 are fixed on the base plate 1 , each bolt III 401 is threadedly connected to a nut III 402 , and a small-end air outlet side pressure plate 403 is slidably connected to the two bolts III 401 . The small-end air outlet side pressure plate 403 is installed above the base plate 1 in an adjustable height through the nut III 402 .

[0037] Furthermore, the flatness of the upper surface of the base plate 1 is 0.03, the upper surface of the base plate 1 is the reference plane, the parallelism of the lower surface of the base plate 1 to the upper surface is 0.03, and the perpendicularity of the back arc side of the base plate 1 to the upper surface of the base plate 1 is 0.03. Several pin holes and bolt holes are respectively provided on the left and right sides of the base plate 1 for fixing the big head positioning plate 201 and the small head positioning seat 301. The big head positioning plate 201 is 13mm thick with a tolerance of ±0.02. Two pin holes with a diameter of 8mm and three countersunk threaded holes are provided on the big head positioning plate 201. The big head positioning plate 201 is fixed to the base plate 1 by pins, and then the big head positioning plate 201 is further fixed to the base plate 1 by bolts. The total height of the small head positioning seat 301 is 72.5mm, with a tolerance of ±0.02, which is used to ensure the positioning accuracy of the difference between the air inlet side of the big head edge plate and the air inlet side of the small edge plate after clamping. In order to avoid the arc positioning pin 7 of the small head edge plate, a positioning block 302 is provided to protrude from the left end face of the small head positioning seat 301. In order to ensure the rigidity of clamping and avoid stress concentration during clamping, a 45° chamfer is provided at the lower connection between the positioning block 302 and the small head positioning seat 301. The small head positioning seat 301 is fixed to the base plate 1 by pins and bolts. The large head pressure plate 204 is designed as a triangular structure, and the two clamping jaws 205 are spaced apart to avoid interference with the high point of the blade during clamping. The small head air outlet side pressure plate 403 is a strip pressure plate with a width of 34mm, a thickness of 22mm and a total length of 245mm. It is pressed on the air outlet side of the small head and is used for processing the edge plate where the pin is located, the air outlet side of the pin, and the two side surfaces of the pin. The small head air outlet side pressure plate 403 is provided with waist-shaped holes at both ends for the bolt III 401 to pass through.

[0038] During use, nut I 203 is rotated, pressing down on the large-end pressure plate 204. The large-end pressure plate 204 and the large-end positioning plate 201 clamp the inlet-side edge plate of the gas turbine guide vane, completing the clamping of the large end of the blade. Nut II 304 is rotated, pressing down on the small-end pressure plate 305. The small-end pressure plate 305 and the positioning block 302 clamp the inlet side of the edge plate where the small-end pin of the gas turbine guide vane is located, completing the clamping of the small end of the blade. Nut III 402 is rotated, pressing down on the small-end outlet pressure plate 403, completing the clamping of the middle portion of the blade.

[0039] Furthermore, by providing three pressure plates, namely the large end pressure plate 204, the small end pressure plate 305, and the small end outlet side pressure plate 403, the gas turbine turbine guide vanes can be clamped and fixed in two alternating groups. During processing, the large end pressure plate 204 and the small end pressure plate 305 are first used to fix the gas turbine turbine guide vanes. The large end outlet arc, the outlet arc positioning groove, the axial positioning groove and the outlet side plane, the small end outlet side plane, and the radial positions of the large and small ends can be processed. After processing is completed, the small end outlet side pressure plate 403 is installed and the small end pressure plate 305 is removed. The outlet side and both sides of the pin can be processed. In a single clamping operation, by exchanging the small end pressure plate 305 and the small end outlet side pressure plate 403, the gas turbine turbine guide vanes can be fixed and clamped, and multiple locations can be processed. This achieves semi-integrated blade processing, shortens the process flow, and significantly improves blade processing accuracy by reducing reference conversion.

[0040] Specific implementation method 2: See Figure 5 and 10 As shown, the base plate 1 of this embodiment is provided with two inner radial positioning seats 501, the inner radial positioning seat 501 is provided with an inclined end face 502, the inclined end face 502 is threadedly connected with a bolt IV 503, and the bolt IV 503 is threadedly connected with a nut IV 504 for fixing the bolt IV 503 and the inclined end face 502.

[0041] Furthermore, the inner radial locating seat 501 is an auxiliary locating block, providing auxiliary support for the inner radial direction of the large and small head edge plates, preventing blade displacement during machining when the clamping force alone is insufficient to counteract the machining forces of the machine tool. An M12 bolt hole is centrally located on the angled end face 502 of the inner radial locating seat 501, for installing a hexagonal bolt and nut. The bolt height is adjusted to ensure a close fit against the inner radial direction, providing auxiliary support for the gas turbine guide vanes.

[0042] Specific implementation method three: see Figure 5 As shown, two airway back arc positioning pins 6 are provided on the transverse midline of the base plate 1 in this embodiment.

[0043] Furthermore, two 20mm diameter locating pin holes are provided along the longitudinal axis of the base plate 1, located near the large end locating plate 201 and the small end locating seat 301, respectively. Two 20mm diameter airway back arc locating pins 6 are fitted to the aforementioned locating pin holes with an H7 fit accuracy. The airway back arc locating pins 6 are used to locate the intermediate airway back arc. During clamping, the intermediate airway back arc of the gas turbine turbine guide vane is placed against the airway back arc locating pins 6, completing the positioning of the blade in the width direction of the base plate.

[0044] Specific embodiment 4: Referring to FIG5 , two small head edge plate arc positioning pins 7 are fixed on the bottom plate 1 of this embodiment, and the small head edge plate arc positioning pins 7 are arranged on the left side of the small head positioning seat 301 .

[0045] Furthermore, two 10mm diameter locating pin holes are provided on the base plate 1 near the small end locating seat 301. Two 10mm diameter small end plate arc locating pins 7 are fitted into these locating pin holes with an H7 fit. The small end plate arc locating pins 7 are used to locate the small end plate arc. During clamping, the small end plate arc of the gas turbine turbine guide vane is pressed against the small end plate arc locating pins 7, achieving two-point contact and positioning with the arc surface, thus completing the positioning of the blade along the length of the base plate.

[0046] Specific implementation method five: see Figure 6-8 As shown, the big head pressure plate 204 of this embodiment is provided with a waist-shaped hole I, and the bolt I 202 passes through the big head pressure plate 204 through the waist-shaped hole I, and the waist-shaped hole I is used to adjust the relative lateral distance between the big head pressure plate 204 and the bolt I 202; the small head pressure plate 305 is provided with a waist-shaped hole II, and the bolt II 303 passes through the small head pressure plate 305 through the waist-shaped hole II, and the waist-shaped hole II is used to adjust the lateral relative distance between the small head pressure plate 305 and the bolt II 303.

[0047] Specific implementation method six: see Figure 6-8 As shown, the lower end of the large head pressure plate 204 of this embodiment is fixed with a support screw I206, and the lower end of the support screw I206 abuts against the base plate 1; the lower end of the small head pressure plate 305 is fixed with a support screw II306, and the lower end of the support screw II306 abuts against the small head positioning seat 301.

[0048] Furthermore, an M16 bolt hole is provided on the end of the large-head pressure plate 204 away from the clamping jaws 205, into which a support screw I 206 is secured. During clamping, support screw I 206 acts as a lever, supporting the base plate 1 by tightening nut I 203. Nut I 203 presses down on the large-head pressure plate 204, causing the clamping jaws 205 to compress the blade. The same principle applies to support screw II 306.

[0049] Specific implementation method seven: See Figure 8 As shown, the left end surfaces of the small head positioning seat 301 and the positioning block 302 of this embodiment are configured to be arc-shaped.

[0050] Furthermore, in order to avoid the arc of the lower end face of the gas turbine guide vane, the small head positioning seat 301 and the positioning block 302 are designed to be in an arc shape.

[0051] Specific implementation method eight: see Figure 10As shown, the inclination angle between the inclined end face 502 of the inner radial positioning seat 501 and the bottom plate 1 is designed according to the inner radial angle of the blade, and the inclination angle is 45-65°, and the inclination angle is preferably 55°.

[0052] Specific implementation method nine: See Figure 9 As shown, the positioning block 302 of this embodiment is provided with a plurality of empty knife grooves 307 .

[0053] Furthermore, two empty slots 307 are provided, each having a width of 20 mm and a depth of 20 mm. After the blades are clamped, the pin side of the gas turbine guide vane is located at the upper end of the empty slot, so that after removing the small head pressure plate 305, the pin sides of the gas turbine guide vane can be machined.

[0054] Specific implementation method ten: See Figure 3 As shown, two airway pressure plate screws 8 are fixed to the upper end surface of the base plate 1 in this embodiment.

[0055] Furthermore, an airway pressure plate screw 8 is provided to fix the small-end outlet side pressure plate 403 on the airway pressure plate screw 8, and the airway of the gas turbine turbine guide vane is pressed by the small-end outlet side pressure plate 403 to complete the fixation.

[0056] Processing steps: Place the blade on the fixture with the large head edge plate air inlet side corresponding to the large head pressure plate 204, and the edge plate air inlet side where the small head pin is located corresponding to the small head pressure plate 305, so that the air duct back arc in the middle of the blade is in close contact with the two air duct back arc positioning pins 6 on the bottom plate 1, and the small head end face arc is in close contact with the two small head edge plate arc positioning pins 7 on the bottom plate 1. If all four positioning pins cannot be in close contact, remove the air duct back arc positioning pin 6 near the small head edge plate. Press the large head pressure plate 204 and the small head pressure plate 305. Use a dial indicator installed on the machine tool spindle to check the arc runout of the air outlet edge. If it is unqualified, adjust the gap between the blade and the air duct back arc positioning pin 6 or the small head edge plate arc positioning pin 7 to make the runout qualified. After passing the test, adjust the inner radial positioning seat 501 bolt so that the inner radial positioning seat 501 bolt is in full contact with the inner radial surface of the blade. Start processing the arc positioning groove, axial positioning groove and outlet side plane of the large head, process the outlet side plane of the small head, and then process the radial back of the large and small heads; after processing is completed, install the small head outlet side pressure plate 403, clamp and remove the small head pressure plate 305, and process the outlet side and both sides of the pin; until the blade is completely processed.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A double precision casting guide vane clamping device, characterized by: It comprises a bottom plate (1), a large head positioning plate (201), a bolt I (202), a nut I (203), a large head pressure plate (204), a small head positioning seat (301), a bolt II (303), a nut II (304), a small head pressure plate (305), a bolt III (401), a nut III (402) and a small head air outlet side pressure plate (403); A large head positioning plate (201) is fixed to the left side of the upper end surface of the bottom plate (1), two clamping claws (205) are arranged on the large head pressure plate (204) at intervals, a bolt I (202) is fixed to the upper end surface of the bottom plate (1), the large head pressure plate (204) is slidably connected to the bolt I (202), a nut I (203) is threadedly connected to the bolt I (202), and the large head pressure plate (204) is installed above the large head positioning plate (201) in an adjustable height through the nut I (203); A small head positioning seat (301) is fixed on the right side of the upper end surface of the bottom plate (1), a positioning block (302) protruding from the left end surface of the small head positioning seat (301) is provided on the small head positioning seat (301), a bolt II (303) is fixed on the small head positioning seat (301), a small head pressing plate (305) is slidably connected to the bolt II (303), a nut II (304) is threadedly connected to the bolt II (303), and the small head pressing plate (305) is installed above the small head positioning seat (301) in an adjustable height through the nut II (304); Two bolts III (401) are fixed on the bottom plate (1), each bolt III (401) is threadedly connected to a nut III (402), and a small-end air outlet side pressure plate (403) is slidably connected to the two bolts III (401). The small-end air outlet side pressure plate (403) is installed above the bottom plate (1) in an adjustable height through the nut III (402).

2. The double precision casting guide vane clamping device according to claim 1, characterized in that: Two inner radial positioning seats (501) are provided on the base plate (1), and an inclined end surface (502) is provided on the inner radial positioning seat (501). A bolt IV (503) is threadedly connected to the inclined end surface (502), and a nut IV (504) for fixing the bolt IV (503) and the inclined end surface (502) is threadedly connected to the bolt IV (503).

3. The double precision casting guide vane clamping device according to claim 1, characterized in that: Two airway back arc positioning pins (6) are provided on the transverse midline of the base plate (1).

4. The double precision casting guide vane clamping device according to claim 1, characterized in that: Two small head edge plate arc positioning pins (7) are fixed on the bottom plate (1), and the small head edge plate arc positioning pins (7) are arranged on the left side of the small head positioning seat (301).

5. The double precision casting guide vane clamping device according to claim 1, characterized in that: The large-head pressing plate (204) is provided with a waist-shaped hole I, and the bolt I (202) passes through the large-head pressing plate (204) through the waist-shaped hole I; the small-head pressing plate (305) is provided with a waist-shaped hole II, and the bolt II (303) passes through the small-head pressing plate (305) through the waist-shaped hole II.

6. The double precision casting guide vane clamping device according to claim 1, characterized in that: The lower end of the large head pressing plate (204) is fixed with a supporting screw I (206), and the lower end of the supporting screw I (206) abuts against the bottom plate (1); the lower end of the small head pressing plate (305) is fixed with a supporting screw II (306), and the lower end of the supporting screw II (306) abuts against the small head positioning seat (301).

7. The double precision casting guide vane clamping device according to claim 1, characterized in that: The left end surfaces of the small head positioning seat (301) and the positioning block (302) are arranged in an arc shape.

8. The double precision casting guide vane clamping device according to claim 2, characterized in that: The inclination angle between the inclined end surface (502) of the inner radial positioning seat (501) and the bottom plate (1) is 55°.

9. The double precision casting guide vane clamping device according to claim 1, characterized in that: The positioning block (302) is provided with a plurality of empty knife grooves (307).

10. The double precision casting guide vane clamping device according to claim 1, characterized in that: Two airway pressure plate screws (8) are fixed to the upper end surface of the base plate (1).

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